Radio Signal Transfer Extension Converts Wired to Wireless

Easy to install universal: This doorbell extender is installed without cable polarity with a power supply voltage of 3-24V AC/DC; Transformer required if >24V; Compatible with mechanical doorbell, wired doorbell Transform wired doorbells into wireless doorbells: the doorbell extension kit instantly converts traditional wired doorbells into a wireless doorbell system, while keeping the existing doorbell and enjoying modern comfort Multiple ring tones and adjustable volume: Portable receiver with 32 ring tones and volume from 0-100 dB; Set different ring tones by transmitter; Silent mode helps avoid sleep disturbances; Flashing LED (Suitable for the hearing impaired) Long signal range: provides stable signal transmission up to 100m (328 ft) outdoors; Portable receiver with removable backplate, screws and adhesive included. Wall mounted or portable Expandable wireless system: Supports the simultaneous operation of multiple transmitters (front/rear door), expandable up to 20 transmitters; The receiver can be purchased on request and is suitable for houses/apartments/gardens