Our advantage: 1.Self powered button: kinetic energy is converted into electric energy, no battery is needed. No need to worry about the battery not having electricity, miss the visit of friends. So that you can save more money because you don't need to buy a battery 2. Unique 4 modes: Sound only, flash only, sound & flash, sound & light on. More humane care for the elderly and children 3.Memory function: After the power is turned off, remember the music set before. No need to set music again. 4. Learning code function: Ensure that the doorbell of the neighbor does not interfere. At the same time, you can freely add buttons and receivers. 5. Pass CE and FCC certification: apply safer and more assured. 100% tested before shipping Other parameters: Receiving distance: 150 M (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. Waterproof rating: IP44 7. Receiver size: 86*78mm 8. Button size: 80*41mm 9: Button fixing method: screw + double-sided tape 10: Working temperature: -20 ° C ~ -60 ° C How to pair signals: The pairing signal is very simple. Hold down the mode key for 5 seconds, hear "Bird cry" sound and see the light flash, immediately press the button, the signal is paired successfull About waterproof instructions: 1.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 2. The waterproof cover is not included in the list and requires additional purchase. You can find the link on the store homepage or contact customer service About the distance description: 1.The receiving distance may be affected by the environment or obstacles 2. The button cannot be placed on the iron door, which will shield the signal. We recommend that the button be placed next to the iron door. 3. In addition, the receiver should not be placed near the microwave or the radio, which would interfere with the signal. #doorbell#doorbellWireless#doorbellwifi#wireless #door #bell#Door #Doorbell#Waterproof doorbell