Smart Self-powered Wireless Doorbell Ring for Apartments Classroom Kitchen

Specification: 
Product: Doorbell Transmitter; 
Product weight: 45g; 
Working voltage: self-generation; 
Standby power consumption: 0W; 
Wireless frequency: 433.92MHz; 
Working temperature: -10℃-60℃; 
Distance: Outdoor about 80M Indoor about 30M; 
Product: Receiver; 
Product size: 83x48x23.5mm; 
Product weight: 59g; 
Working voltage: 110-240V AC; 
Standby power consumption: 0.5W; 
Wireless frequency: 433.92MHz; 
Working temperature: -10℃-60℃; 
Distance: Outdoor about 80M Indoor about 30M; 
 
Package Includes: 
1 * Doorbell Transmitter; 
1 * Doorbell Receiver; 
1 * Manual;