Easy Installation: The latest wireless doorbell upgrade is a self-powered doorbell transmitter, without any batteries, just plug the receiver into an electrical outlet, the push button transmitter can be stuck to the door with the supplied adhesive strips. IP44 Waterproof Door Push Button: The door transmitter waterproof rate is IP44, used for rainy days or even hot or cold weather special with an operating temperature of -30 to 70 degrees Fahrenheit; The waterproof is only for doorbell push button. CE, FCC, RoHS certified. 400 feet long wireless range: you will be easily notified when someone is calling outside your home and never miss your precious guests; 2 self-powered doorbell transmitter buttons and 2 plug-in home receivers have already been paired at the factory so that you can use them directly for your home Home doorbell receiver button and mode: this doorbell has two buttons to control the volume. The volume is 25-80db 1-38 music optional. Each time you press the mode button, you change a mode according to your preference and the three modes alternate. The LED flash also works for the hearing impaired. Features: 1. Easily select volume and music, smart design 2. Self-learning code function: choose your favorite music. Then pairing method: New style pairing method: press and hold the music key for 5 seconds, (old style pairing method: press and hold the volume key for 5 seconds.) When you hear the dingdong and see the lights flash, press the button immediately, the signal is paired successfully. You can try 2 methods. 3. Compatible with 12V23A alkaline battery (not include battery) 4. Receiving distance: 300m (in open area) 5. Volume: 5 files (can be muted) 0-110db, ringtones: 60 pcs 6. Transmitter size: 75X51X20MM. 7. receiver size: 95X65X24MM. 8. Receivers Rated voltage: AC 110V-220V -240V. 9. working frequency: 433MHZ, can be customized to other frequency. 10.The use of microprocessor control, double-sided PCB micro-power supply design. 11. Buttons can set different music to distinguish front and back doors 12.Friends, our button waterproof rating is IP44, general use is no problem, but heavy rain may affect the life expectancy, we recommend that you purchase a waterproof cover, so use longer and more secure. The waterproof cover needs to be purchased separately