Solight wireless doorbell, for socket, 120m, white

"Learning code" function allows you to pair multiple bells or buttons into one group of 36 selectable melodies LED ring indicator on the bell and on the button button with cover on the nameplate setting the bell volume - 2 levels (65 - 95dB) night light color: white transmission frequency: 433MHz signal range in the open: 120m power supply: button: 1 x 12V (LR23A) battery (included in the package) bell: AC 230V - into the socket working temperature: -15 ° C to + 65 ° C spare button Solight No. 1L42T for one bell can be paired max. 4 buttons one button can be paired with max. 4 bells