power supply of the main unit 230 V AC power button unpowered reach of the button 180 m special functions battery-free button optical signaling on the button yes optical signaling on the doorbell yes option to add another button yes, max. 6 extra (spare) button P5729T volume control yes, 4 levels maximum ringing volume 90 dB number of melodies 36 number of receivers in a package 1 pc number of buttons in a package 1 pc colour black pairing method automatic pairing – self-learning waterproof button IP44 transmission method wireless bell transmission frequency 433 MHz packaging 1 pc, blister doorchime dimensions 73 × 73 × 81 mm button dimensions 22 × 49 × 82 mm
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