EMOS Wireless doorbell P5741

color: green | button range: 100 m | maximum ring volume: 85 dB | possibility to add another button: yes, max. 3 | main unit power supply: 230 V AC | button power supply: 1 × 12 V A23 (included in the package) | optical signaling on the button: yes | optical signaling on the bell: no | number of melodies: 3 | number of receivers in the package: 1 pc | number of buttons in the package: 2 pcs | transmission frequency: 433 MHz | additional (spare) button: P5740T | sales package : 1 pc, blister | volume control: yes | special function: low battery indication | waterproof button: yes | pairing method: automatic pairing - self-learning | transmission method: wireless doorbell