【300M Wireless Range】: 2 plug-in receivers included; will not interfere with other equipment in your home or those of your neighbors; ensures that you will never miss any visitors, even if you are several rooms away. (Note: The wireless distance can reach 150-300m in an open and unobstructed environment, and the indoor distance is about 35m) 【55 Beautiful Chimes】: Stereo speaker delivers rich and crisp sound; press the Next or Previous button to easily choose from 55 melodies; 5 adjustable volume levels, with a maximum volume of 100 dB; enjoy pleasant melodies whenever someone rings at your door. 【Memory Function】: Preserves your last set melody and volume level after a power outage; no need to reset to your previous settings; Convenient and easy to use design for a better user experience. 【Memory Function】: Preserves your last set melody and volume level after a power outage; no need to reset to your previous settings; Convenient and easy to use design for a better user experience. 【High Performance Transmitter】: Ultra-low power consumption; uses a battery that boasts a 3 year maximum lifespan; IP55 dust-proof and waterproof; working temperature ranges from -30 °C-70 °C; Withstands various harsh weather conditions. 【Simple Set Up】: Just plug the receiver into a socket and fix the transmitter on a wall with the accessories provided; includes 1 transmitter (battery included), 2 plug-in receivers, 1 piece of double-sided bonding tape, 2 screws, 2 anchors, 1 small screwdriver, 1 user manual.