Wireless doorbell by radiofrequency that allows a maximum distance between pushbutton (emitter) and bell (receiver) of up to 30m. The button works with a 12V 23A battery (included). The receiver works with 3 AA batteries (R6 not included). The bell is designed to be fixed to the wall (includes screw). The push button can be fixed to a surface by means of a double-sided adhesive (included). Push button size: 65 x 40 x 18 mm. Sizebell: 114 x 65 x 25 mm. The timbre has 16 different configurable sounds. Emitter and receiver have LED that is activated by pressing the ringer.