Wireless Radio Signal Extension Kit for Doorbell and Gong Suitable for existing doorbell systems, 1 socket receiver + 1 radio converter (3-24 V AC/DC)

radio transmitter is compatible with electronic, electromechanical and mechanical doorbells and integrates easily and quickly with any existing doorbell system. The two antennas of the transmitter connect to the doorbell power socket and the control button jack, respectively. AC doorbells: no distinction between plus and minus on wires marked (+/-), DC doorbells: distinction between plus and minus on marked wires (+/-). 3-24V AC/DC connection Please note that high voltage circuits should not be connected as there is a risk of short circuit. With this wireless doorbell, you can choose your favorite melody from 58 different polyphonic melodies and change it to your liking. The volume can be adjusted to 5 levels (0-110 dB). wireless doorbell receiver (433 MHz +/- 40 kHz) is connected to the transmitter in open field with a range of up to 200 m. Please do not install the transmitter directly on metal objects, as this will disrupt the transmission signal; obstacles between the receiver and transmitter can also reduce the range. Coupling steps: 1. Short press the up or down key to select your favorite doorbell sound. 2. Then hold down key for about 5 seconds to enter pairing mode (LED flashes quickly). 3. Then press the doorbell button, the receiver and transmitter are connected. Pairing reset: Press down key (or music key) for 5 seconds. If the receiver emits a "ding-dong" and the LED flashes, the reset succeeded. You can then follow the steps above to proceed with a new pairing. If the receiver makes a strange noise or does not make any sound, try this procedure.