---
product_id: 625394282
title: "Smart Mailbox Alarm, Requires SBS50 Base Station, Wireless Long Range Mailbox Alert, Mailbox Sensor for Delivered Mail, SMA51"
brand: "x-sense"
price: "NT$1036"
currency: TWD
in_stock: true
reviews_count: 8
category: "X Sense"
url: https://www.desertcart.tw/products/625394282-smart-mailbox-alarm-requires-sbs50-base-station-wireless-long-range
store_origin: TW
region: Taiwan
---

# 2.4 GHz long-range wireless 4-year battery life 100 dB loud alert Smart Mailbox Alarm, Requires SBS50 Base Station, Wireless Long Range Mailbox Alert, Mailbox Sensor for Delivered Mail, SMA51

**Brand:** x-sense
**Price:** NT$1036
**Availability:** ✅ In Stock

## Summary

> 📬 Stay ahead of the mail game—because waiting is so last season!

## Quick Answers

- **What is this?** Smart Mailbox Alarm, Requires SBS50 Base Station, Wireless Long Range Mailbox Alert, Mailbox Sensor for Delivered Mail, SMA51 by x-sense
- **How much does it cost?** NT$1036 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.tw](https://www.desertcart.tw/products/625394282-smart-mailbox-alarm-requires-sbs50-base-station-wireless-long-range)

## Best For

- x-sense enthusiasts

## Why This Product

- Trusted x-sense brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Effortless Wireless Setup:** 100% wire-free installation with included double-sided tape and intuitive app guidance.
- • **Built to Brave the Elements:** IP65 waterproof rating and UV-resistant shell ensure reliable performance in any weather.
- • **Seamless Multi-User Sharing:** Share alerts with family or roommates via the app for total household mail awareness.
- • **Instant Mail Alerts, Anywhere:** Get real-time push notifications the moment your mail arrives—never miss a delivery again.
- • **Versatile Mailbox Compatibility:** Fits curbside, wall mount, slot, and cluster mailboxes—designed for modern living.

## Overview

The X-Sense Smart Mailbox Alarm (SMA51) is a sleek, wireless sensor that connects via 2.4 GHz Wi-Fi to the SBS50 base station (sold separately). It delivers instant push notifications to your smartphone with a powerful 100 dB alert, supports multi-user sharing, and boasts a 4-year battery life. Designed for all mailbox types except slot-only without lids, it features IP65 waterproofing and UV-resistant materials for durability in extreme weather. Easy to install and manage through the X-Sense app, it’s the ultimate smart home upgrade for mail security and convenience.

## Description

Thermometer Hygrometer Water Leak Detectors

Review: What a range! - This works very well! Highly recommend this and the other X-Sense items like “water detector” & “Thermometer”. The mailbox alarm range is amazing. My mailbox is at the end of my very long drive way. This worked like a champ. Setup was very simple.
Review: Awesome covi - The X-Sense Smart Mailbox Alarm System is a cutting-edge solution for anyone seeking a blend of convenience and security in managing their mail. With real-time push notifications delivered directly to your mobile device, you'll never miss a mail delivery again. Whether you use a curbside, wall-mounted, or cluster mailbox, this versatile system integrates effortlessly into various setups. One of its most impressive features is the long-distance transmission capability, ensuring a strong and reliable connection to the base station. This means you’ll receive timely alerts, even from a considerable distance. The system’s installation is refreshingly simple, requiring no wiring—just the included double-sided tape and user-friendly in-app guidance. Built to last, the X-Sense Mailbox Alarm boasts an IP65 waterproof rating and operates efficiently in extreme temperatures, from 14°F to 140°F. Its durable ASA shell and silicone seal protect against UV damage, guaranteeing longevity even in harsh weather conditions. The replaceable battery, designed to last up to four years with typical usage, further underscores its practicality. Additionally, the system supports multi-user sharing, allowing everyone in your household to stay informed. This thoughtful feature adds to its appeal for families or shared living arrangements. In summary, the X-Sense Smart Mailbox Alarm System combines durability, functionality, and ease of use. Its innovative design not only streamlines mail management but also provides peace of mind, making it a standout choice for modern households.

## Features

- Note: Compatible only with 2.4 GHz Wi-Fi (not 5 GHz). Connects to the X-Sense Home Security App via the SBS50 base station (not included)
- Customize Your Home Safety System: Includes 1 mailbox alarm (requires SBS50 base station, not included); each base station can connect up to 50 X-Sense devices, providing complete coverage for both your indoor and outdoor properties; customize your device names for easy location and management as needed
- Real-Time Push Alerts & Multi-User Sharing: The moment your mail arrives, you'll receive an instant app push alert; manage various features from your phone, such as device sharing, mail reminder, one-button silence, adjusting volume up to 100 dB, and ringtone selection
- Long-Distance Transmission, Accurate Detection: With extensive coverage, the smart mailbox alarm maintains a strong and reliable connection to the base station (not included) via a 2.4 GHz Wi-Fi network, and promptly sends notifications to your phone
- Compatibility with Various Mailbox Types: This mailbox alarm is designed with a sleek and compact profile; compatible with curbside/post mount, wall mount, slot type, and cluster type mailboxes; not suitable for mail slots without lids
- Extra Long Standby, Easy Setup: The replaceable battery offers a long 4-year lifespan based on 5 daily triggers; the alarm is 100% wire-free and easy to install using the double-sided tape included; following the in-app instructions, simply add it to the X-Sense app in seconds
- Built for All-Weather Durability: With its IP65 waterproof rating and an operating temperature range of 14–140°F (-10–60°C), this wireless mailbox alarm operates reliably even in extreme weather; ASA shell and silicone seal prevent fading caused by sunlight and UV rays

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B0CYZKRH49 |
| Audible Noise | 100 Decibels |
| Battery Description | Lithium |
| Best Sellers Rank | #86,811 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #72 in Post-Mount Mailboxes |
| Brand | X-Sense |
| Built-In Media | 1 Smart Mailbox Alarm (Base Station Required) |
| Color | Black |
| Compatible Devices | Smartphone |
| Control Method | App |
| Customer Reviews | 4.2 out of 5 stars 153 Reviews |
| Item Dimensions L x W x H | 3.91"L x 1.06"W x 1.02"H |
| Item Type Name | Mailbox Alarm |
| Manufacturer | X-SENSE |
| Mfr Part Number | X-SENSE |
| Model Number | SMA51 |
| Mounting Type | Wall Mount |
| Number of Batteries | 1 CR2 batteries required. (included) |
| Power Source | Battery Powered |
| Product Dimensions | 3.91"L x 1.06"W x 1.02"H |
| Sensor Technology | Infrared Sensor |
| Size | Only 1 Alarm (Base Station Required) |
| Smart Home Compatibility | Smart Home Compatible |

## Product Details

- **Brand:** X-Sense
- **Color:** Black
- **Compatible Devices:** Smartphone
- **Power Source:** Battery Powered
- **Product Dimensions:** 3.91"L x 1.06"W x 1.02"H

## Images

![Smart Mailbox Alarm, Requires SBS50 Base Station, Wireless Long Range Mailbox Alert, Mailbox Sensor for Delivered Mail, SMA51 - Image 1](https://m.media-amazon.com/images/I/71d+6EvSzML.jpg)

## Available Options

This product comes in different **Color, Size** options.

## Customer Reviews

### ⭐⭐⭐⭐⭐ What a range!
*by R***M on May 18, 2026*

This works very well! Highly recommend this and the other X-Sense items like “water detector” & “Thermometer”. The mailbox alarm range is amazing. My mailbox is at the end of my very long drive way. This worked like a champ. Setup was very simple.

### ⭐⭐⭐⭐⭐ Awesome covi
*by M***N on March 9, 2025*

The X-Sense Smart Mailbox Alarm System is a cutting-edge solution for anyone seeking a blend of convenience and security in managing their mail. With real-time push notifications delivered directly to your mobile device, you'll never miss a mail delivery again. Whether you use a curbside, wall-mounted, or cluster mailbox, this versatile system integrates effortlessly into various setups. One of its most impressive features is the long-distance transmission capability, ensuring a strong and reliable connection to the base station. This means you’ll receive timely alerts, even from a considerable distance. The system’s installation is refreshingly simple, requiring no wiring—just the included double-sided tape and user-friendly in-app guidance. Built to last, the X-Sense Mailbox Alarm boasts an IP65 waterproof rating and operates efficiently in extreme temperatures, from 14°F to 140°F. Its durable ASA shell and silicone seal protect against UV damage, guaranteeing longevity even in harsh weather conditions. The replaceable battery, designed to last up to four years with typical usage, further underscores its practicality. Additionally, the system supports multi-user sharing, allowing everyone in your household to stay informed. This thoughtful feature adds to its appeal for families or shared living arrangements. In summary, the X-Sense Smart Mailbox Alarm System combines durability, functionality, and ease of use. Its innovative design not only streamlines mail management but also provides peace of mind, making it a standout choice for modern households.

### ⭐⭐⭐⭐⭐ Does the job well
*by P***R on March 19, 2026*

Installation was fairly simple following the app and after careful reading of the instructions and watching some YouTube videos. I had to place the mailbox sensor about halfway down the mailbox door due to some metal welded on the top of the inner side, but it functions well nonetheless. After a while, I had to move the base station closer to the front door because I kept putting other things too close to it which interfered with the signal. I am very pleased to know when mail, especially small packages, are delivered to my mailbox. I wish i could get the flashing red X to time out, but this device is the easiest, least complicated way I have found to know when my mail is delivered. Thank you X-Sense.

## Frequently Bought Together

- X-Sense Smart Mailbox Alarm, Requires SBS50 Base Station, Wireless Long Range Mailbox Alert, Mailbox Sensor for Delivered Mail, SMA51
- X-Sense Smart Mailbox Alarm, Wireless Long Range Mailbox Alert, Mailbox Sensor with SBS50 Base Station for Delivered Mail, SMA11
- X-Sense Smart Home Security System, Wireless Home Alarm System 8-Piece Kit, Supports Mobile App Alerts, Compatible with Alexa, Includes 1 Base Station, 4 Door Sensors, 2 Motion Sensors, 1 Keypad, AS08

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*Product available on Desertcart Taiwan*
*Store origin: TW*
*Last updated: 2026-06-18*