Wired Wireless Doorbell P57103 built in

Doorbell set that supports wireless or wired connection with self learning pairing and dual button connection.
Power supply of the main unit: 230 V AC
Power button: 1 × 3 V CR2032 included
Reach of the button: 180 m or wiring connection
Special functions: dual button connection
Optical signaling on the button: yes
Optical signaling on the doorbell: no
Option to add another button: yes max 8
Extra spare button: P5734T P57000T
Volume control: yes 4 levels
Maximum ringing volume: 90 dB
Number of melodies: 10
Number of receivers in a package: 1 pc
Number of buttons in a package: 1 pc
Colour: white
Pairing method: automatic pairing self learning
Waterproof button: IP54
Transmission method: wireless wired doorchime
Transmission frequency: 433 MHz
Doorchime dimensions: 90 × 50 mm
Button dimensions: 19 × 38 × 92 mm
Control by voice assistants: no
Warranty: 2 years