SPEED - 2.4G Wireless USB Chime Bell

SPEED - 2.4G Wireless USB Chime Jingle Bell

SPEED Intelligent Doorbell 2.4G Wireless USB 
Standby Time：10 months
Operation time：3 months（10 times usage per day）

SPEED Door Bell can connect more than one external bell.
SPEED Intelligent doorbell：https://bit.ly/2FerrVm