Wireless doorbell, black, 230Vac, EMOS

power supply of the main unit 230 V ACpower button unpoweredreach of the button 180 mspecial functions battery-free buttonoptical signaling on the button yesoptical signaling on the doorbell yesoption to add another button yes, max. 6extra (spare) button P5729Tvolume control yes, 4 levelsmaximum ringing volume 90 dBnumber of melodies 36number of receivers in a package 1 pcnumber of buttons in a package 1 pccolour blackpairing method automatic pairing – self-learningwaterproof button IP44transmission method wireless belltransmission frequency 433 MHzpackaging 1 pc, blisterdoorchime dimensions 73 × 73 × 81 mmbutton dimensions 22 × 49 × 82 mm