Safety Instructions: 1.please install your chime according to this manual to avoid any malfunctions or damage. 2.the chime is designed for indoor use only. 3.the chime is not user serviceable,there is a danger of electric shock if opened. 4.do not expose directly to rain/dripping or immerse in water. 5.do not mount it close to a fireplace or expose to high temperature. 6.never use any cleaning chemicals or wet cloth to clean the unit. only use a dry, clean and soft cloth/micro fiber cloth. What’s Included in your kit 1*Plug-in chime 1*instruction manual 1. The widest wireless range: This doorbell wireless receiver has a relay function, which can extend the range from 2 feet to 3.3 feet; powerful signal penetration, enhance signal stability; never fail to remind you visitors 2. Multi-choice doorbell: 40mm stereo speakers (CD sound quality), 56 kinds of ringtones are rich and clear; 5 volume levels, the maximum volume is 115 decibels, which is large enough for the elderly to hear 3. Convenient installation: just use the provided screws or glue to fix the wireless doorbell transmitter on the wall; all installation accessories are included, easy to install 4. Durable: replaceable CR2032 battery with a service life of up to 3 years; IP55 waterproof rating and -4 to 140 degrees Fahrenheit operating temperature, can withstand all kinds of weather 5. Once and for all: Even after a power failure, the innovative memory function can remember the melody and volume set last time; no need to reapply the previous settings