Specification
Transmitter Style: Push Button
Transmitter Power Mode: Self-Powered / Battery-Free
Receiver Voltage: 85V~265V
Plug Type: US Standard
Transmission Method: Wireless
Remote Control Range: 30~50 meters
Number of Songs: 48 songs(Default: Ding-Dong)
Volume Range: 6 grade(including silence)
Operating Temperature: -25℃ to +50℃
Transmitter Lifetime: 200,000 clicks
Battery Required? No
Transmitter Dimensions: Φ70mm*15.5mm
Receiver Dimensions: 3.7 in x 2.09 in x 1.34 in (94 mm x 53 mm x 34 mm)
Weight: 180g

Packing List
1 * Transmitter
1 * Receiver
1 * User Manual(English)
1 * Sticker(Please Ring the Doorbell)
1 * Double Side Tape
1 * Screw

•  No Battery - The doorbell transmitter is embedded with micro generator which can collect energy when press. No battery inside.
   Durable - Embedded with micro generator = At least 160 batteries(Based on 20 years)
•  Maintenance-Free - No need to change the battery frequently, save money, and eco-friendly.
   Wireless - Operating range of over 30 meters (100 meters in open area)
•  Strong Signals - Each press will send out three signals.The strong signals can pass through 3 walls and get strong feedback from every press.
   Waterproof - A doorbell with no battery has strong waterproof function
  
•  48 Wonderful Songs - Abundant songs and 6-level volumes are Available
   Refined Shape Small Size - Never affect the use of other electrical appliances
  
•  Multiple security protections, eliminate many security risks - Lowest power consumption design, no heat, safe and reliable. Anti-Surge, Anti-Lightning, Anti-Static
  20 Years Long Lifetime - Outdoor transmitter has passed the pressing test with 200,000 clicks while the indoor receiver has passed extremely harsh aging tests. The doorbell is still working stablely even in a variety of harsh environmental.
  

 No Battery - The doorbell transmitter is embedded with micro generator which can collect energy when press. No battery inside.
 Durable - Embedded with micro generator = At least 160 batteries(Based on 20 years)Zmlink