- Classic Wireless USB-AC Door chimey

- Learning code matching of chime and transmitter to avoid interference

- Wireless working range in 100 meters in open area

- 36 melodies to choose by door chime

- Select the interesting melodies on chime freely

- Sound volume can be adjusted in 3 level from 30dB to 80dB

- Working method of chime: melody+lighting

- Frequency in 433MHz

- Power of chime by 110-240V via USB adaptor

- Power of transmitter 1pcs CR2032 battery