EMOS Wireless Doorbell with Button AC P5740

Wireless doorbell AC P5740 Emos with remote control. Operating range up to 100 m in open space, 3 melodies, maximum volume of the bell 85 dB, possibility to add one more button, but not more than 3, transmission frequency 433 MHz, button power source 1 × 12 V A23 (included in the set), power source for the bell 230 V