Receiver battery: 3*AA (not included)

Transmitter battery: 1*3V, CR2032 (included)

Using high frequency transmit technology and innovative function of same frequency with different code, one doorbell has one code to avoid interference

Radio frequency: 433.92MHz

3 melodies

Volume adjustment

Transmitter is IP44

Operating range up to 100/200 meters in the open area

Different color for choosen: black, white