Strong anti-interference
Low power consumption
The idea for home, office, factories, guest rooms in the hotel, etc..
Installation

Open the battery compartment cover of the receiver and load 4 x R14/C batteries (Not included)
Fix the transmitter on the wall near the door with screws or adhesive tapes.
Avoid placing the transmitter near the high-temperature moist area, metal or electromagnetic surfaces
Please replace the battery if the transmitter is not functioning properly
Package Dimensions10.5x5x17cm