Features: 
1. 4 Modes: Sound only, flash only, sound & flash, sound & light on.Light on mode can turn into a nightlight. 
2. Memory function: After the power is turned off, remember the music set before. No need to set music again. 
3. Self-powered doorbell that requires no battery,Don't worry if the battery has power, so Don't miss important visitors. 
4. Gorgeous lights, loud ringtones. Especially suitable for the elderly, sluts. 
Clear sound, no noise, loud sound. 
4 files volume 0-100DB Ringtones: 58 pcs Rated voltage: AC 110~ 240V, 50-60Hz. 

Self powered button and waterproof instructions: 
1.No battery required.Self-powered doorbell that requires no battery,Don't worry if the battery has power, so Won't miss important visitors
2.our button waterproof rating is IP44, the general use is no problem, but heavy rain may affect the life expectancy, we recommend the purchase of waterproof cover, so use longer and more secure. 
  
Specification: 
1. Receiving distance: 150M (in open area). 
2. Volume: 4 files 0-100DB, ringtones: 58 pcs. 
3. Rated voltage: AC 110~ 240V ,50-60Hz. 
4. Working frequency: 433MHz. 
5. Receiver standby power:< 0.5W. 
6. Receiver size: 86X78mm. 
7. Button size: 80x41mm. 
  
Package includeds: 
1/2 x Transmitter. 
1/2 x Receiver. 
1 x Installation Kit. 
1 x User Manual