Features:
New creative design: battery-free wireless doorbell.
Do not need any battery or power line to charge the transmitter， and it can transform its own mechanical energy to electrical energy by pressing the button on it.
Do not need any wire for installation， easy and convenient to use.
Transmitter can be used in both high-temperature and low-temperature environment: from -40 to 50 Celsius degree.
Transmitter is made of ASA plastic， durable to use.
Waterproof transmitter: can stand against heavy rain.
Receiver is made of ABS plastic， inflaming retarding and environmental protection.
Long wireless transmission distance: up to 100 meters (no obstacles， in open field).
Easy operation: the transmitter can be fixed on the wall by screws or adhesive pad and the receiver can be inserted to the power socket.
25 different polyphony ring tones for your choice.
Low crosstalk rate.
Blue LED light indication.
One receiver can be matched with three transmitters at the most; one transmitter can be paired with several receivers and the number of receivers is not limited.

Note: This product includes one transmitter and one receiver.

Specifications:
Model: E1
Receiver:
Power Supply: AC 100V~240V
Operating Temperature: -10℃~+50℃
Range(Open Field): 100 meters
RF Frequency: 433MHz
Sound Level: 80dB@ 3ft(1m)
Power Consumption: 200mW
Indicator Color: Blue
Transmitter:
Power Supply: Self-powered
Operating Temperature: -40℃~+50℃
Waterproof: Yes
Operating Forces: 10N
Transmitter size: 7.9 * 4.4 * 2.6cm / 3.1 * 1.7 * 1.1in
Transmitter weight: 53g / 1.86oz
Receiver size: 7.9 * 4.9 * 3.0cm / 3.1 * 1.9 * 1.2in
Receiver weight: 63g / 2.22oz
Package size: 15.5* 14.4 * 7.2cm/ 6.3 * 5.7 * 2.8in
Package weight: 169g/ 5.96oz

Package List:
1 * Transmitter
1 * Receiver
1 * Mounting Kit
1 * Adhesive pad
1 * User manual(English)