Easy installation: The latest upgrade of the wireless doorbell is a self-powered transmitter doorbell, without any battery, just plug the receiver into an electrical outlet, the push button transmitter can be stuck to the door with the adhesive strips provided. IP44 Waterproof Door Push Button: The waterproof rate of the door transmitter 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 the doorbell push button. CE, FCC, RoHS certified. 400ft long wireless range: you will be easily informed when someone calls outside your home and never miss your precious guests; 2 self-powered doorbell transmitter buttons and 2 plug-in home receivers have already been factory paired so 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 to your preference and the three modes cycle through. LED flash also works for hearing impaired people. Features: 1. Easily select volume and music, intelligent 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: 300 m (in open area) 5. Volume: 5 files (can be muted) 0-110db, ringtones: 60 pcs 6. Transmitter size: 75X51X20MM. 7. receiver size: 95X65X24 MM. 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. The buttons can set different music to distinguish the front and rear doors 12.Friends, our button waterproof rating is IP44, general use is not a problem, but heavy rain may affect life expectancy, we recommend purchasing a waterproof cover, so use longer and more secure.The waterproof cover needs to be purchased separately