1) Wireless door bell 688
2) 32 multi-music for choice
3) Remote-controled range:30-50 meters

Product name: wireless door bell 688

Advantage:

1) Remote-controled range to30-50 meters

2) 32 multi-music for choice

3) can provide OEM & ODM service

Product details:

1) 32 multi-music for choice
2) Remote-controlled rang 30-50 meters
3) Use 1"AAA" battery for Launchers
4) Use 3"AAA"batteries for Receiver