Home House 4 Volume Wireless Doorbell Chime 2 Receiver + 1 Doorbell

Features: 
Wireless door bell. 
With alarm function. 
Waterproof. 
Stylish look and light touch design. 
Easy to install. 
Ultra-low power design, power saving and long-lasting use. 
52 polyphonic ringtones. 
4-level optional volume adjustment. 
900ft maxium wireless range in the open air. 
Push buttons max.16. 
  
Specification: 
Receiver: 
Working Voltage: AC 90~250V. 
Power Consumption: 10mW. 
Sensitivity: -110dbm. 
Volume: 10-110db. 
Working Frequency: 433.92Mhz±280Khz. 
Transmit Power: 0dbm. 
Color: White. 
Quantity: 2pcs. 

Doorbells: 
Power Consumption: ≤0.01mW. 
Modulation mode: ASK/OOK. 
Battery: 12V/23V alkaline battery. 
Working Frequency: 433.92Mhz±280Khz. 
Transmit Power: 0dbm. 
Color: White. 
Quantity: 1pcs. 
  
Package Included: 
1 x Receiver. 
2 x Doorbells. 
1 x User Manual. 
1 x Mounting Hardware