Luckarm Intelligent Wireless Doorbell, Remote Control Doorbell Battery operated

Specification
Output Power: 5W
Battery Capacity: 2000mAh 3,7V
Input: 5V 0,5A
Output frequency: 150Hz-20KHz
Product Dimension: 3,62″*3,62″*1,65″
Product Weight: 183g
Music playing time: More than 6 hours
Talk time: More than 6,5 hours
IOS battery display: Supported