Wireless Door Chime, Door Open Contact Sensor Alarm with 500 FT Range, 58 Chimes and 5 Volume Levels for Business/Store/Home/Office When Entering, 2 Transmitter + 2 Plug-in Receiver (Black)

描述

Wireless Door Chime, Door Open Contact Sensor Alarm with 500 FT Range, 58 Chimes and 5 Volume Levels for Business/Store/Home/Office When Entering, 2 Transmitter + 2 Plug-in Receiver (Black)