*Features*: **1000FT Long Operating Range*:Featured with a 1000FT transmitting range,1plug-in receivers included ensures you hear the bell and will never miss a visitor. One transmitter can pair to more than one receivers and one receiver can pair to more than one transmitters. Bring much convenience for your multiple rooms design house. Our package include 1 receiver and a transmitter. **52Melodies to Choose*:Stereo speaker delivers rich and crisp sound;4 adjustable volume levels(25 dB,60dB,95dB and 110dB). LED indicators of receivers and transmitter alert those with impaired hearing or when the doorbell sound is(temporarily) not heard. **Durable Material and Long Lifespan*:Adopt ABS material,lightweight but durable. Featured with low power consumption,energy-saving and environmentally-friendly. Abrasion resistant transmitter and receiver with IP44 waterproof performance can serve you longer,even in outdoor use. **Widely Used*:Widely used in front door,back door,sliding door,main floor,basement,garage,toddler room,baby room,play room,pool door,shed,storage,attic,gates,office and warehouse,etc.. **Easy to Install*:Just plug the receiver into a socket and fix the transmitter on a wall with the accessories provided which using screws or strong adhesive stickers to position. Note:Repair asks for the help from professional repairer in order to protect our doorbell. Install them in a place sheltering from rain and sun directly lighting. *Specifications*: Product Type: Wireless Doorbell Plug Available: US Plug Receiver Charging Socket: 110V (US Plug), 220V (EU Plug) Controllable Receiver Volume: 4 Levels (25dB, 60dB, 95dB, 110dB) Transmitter Working Voltage: 12V Transmitter Working Frequency: 433.92MHz±280KHz Chime Tunes: 52 Chimes Operating Range: 304m/1000FT Transmitter Battery: Inbuilt a 12V/23A Alkaline Battery Waterproof Performance: IP44 Material: ABS Material Color: Aqua Working Temperature: -15℃-60℃/5℉-140℉ Receiver Size: 7.7 x 8.7 x 5.5 cm/3.03×3.43×2.17inches (L×W×H) Transmitter Size: 4.2 x 1.8 x 7 cm/1.65×0.71×2.76 inches (L×W×H) Weight: 117g/0.26lbs Package Size: 10.4 x 8.5 x 6.1 cm/4.09”×3.35”×2.40”(L×W×H) Package Weight: 167g/0.37lbs *Package Lists*: 1 x Receiver 1 x Transmitter 2 x Screws 2 x Expansion Bolts 1 x Double-Sided Tape 1 x User Manual