Doorbell - outdoor signal range: 150m, Learning Code allows multiple doorbells or buttons to be paired into one group, 36 optional melodies, LED doorbell ringing indicator, waterproof IP44 button protection, 4-way bell volume adjustment (10 - 80dB), button is fastened with self-adhesive pad or mounting holes, transmission frequency: 433MHz, power: button: 1x 12V (LR23A) battery (included), doorbell: AC 230V - socket, operating temperature: -10°C to + 40°C, power consumption: receiver (doorbell) in idle mode: <0.5W, transmitter (button) in operating mode: <10mW