EMOS Wireless Doorbell with Button DC P5728, Black

Wireless doorbell DC P5728 black. Operating range up to 180 m in open space, 52 melodies, maximum volume of 90 dB, possibility to add one more button, but no more than 6, transmission frequency 433 MHz, power source for button 1 × 12 V A23 (included), power source for doorbell 3 × 1.5 V AAA (not included).