【400m/1,300ft Wireless Doorbell】 TECKNET doorbell boasts a remote connection up to 400m/1,300ft and does not interfere with other equipment in your home, which ensures you will never miss a visitor. Perfect for homes, apartments, villas, offices, classrooms, hotels, factories, and hospitals 【IP65 Waterproof & Ultra-Long Lifespan】 This cordless doorbell system easily withstands harsh weather from -4 °F to 140 °F. While the indoor receiver plugs into a wall outlet, the outdoor transmitter operates on a long-lasting CR2032 lithium battery. Thanks to its ultra-low power consumption, the transmitter battery lasts up to 4.5 years, eliminating the hassle of frequent replacements. 【60 Chimes & 5 Volume Levels】The doorbell wireless features 60 chimes and 5 level adjustable levels (0db to 120dB) to suit your needs. Doorbell RGB lights flashing can help people with hearing impaired 【Smart Memory Function】 The wireless doorbell is equipped with a smart memory function. Every time the device is powered on, it automatically recalls your previously set melody and volume level — no need to reset it, even after a power outage 【3 Working Modes】 This doorbells wireless offers 3 flexible working modes to suit different occasions. Silent Mode (LED Flashing) is ideal for situations when someone is resting or a quiet environment is needed. Sound Only / Sound and Flash Mode is perfect for daily use or social gatherings, ensuring you never miss a visitor 【Effortless Installation】 This plug in doorbell receiver easily plug into an electrical outlet (no batteries required for main receiver). Push button of the door bells wireless cordless can be fixed to the doorframe with screws, or attached by using double-sided adhesive tapes. Simply mount the door bells where needed and you are ready to go 【Package Contents】 Support available for 36 months (Registration Required), 1 X TECKNET wireless doorbell plug in receiver, 1 x doorbell transmitter. 1x battery CR2032, Double-sided adhesive tapes, Screws and 1x user manual