Voltage receiver: AC110-240V Ring Tone: 60 polyphonic ring tones for optional Waterproof: IP44 (transmitter) Remote range: 300 meters in open area Transmitter power: 12V23A alkaline battery (not included) Volume: 5 files How to pair signals Pairing : Press and hold the volume button on the receiver for about 5 seconds (the light is on), release the volume button and press immediately, the signal will pair successfully. How to modify and block music Press and hold the volume button on the receiver before plugging in the outlet. Plug in the power socket until the receiver light turns on, release the volume button, press the music button to adjust to your favorite music ringtone, press and hold the volume button again until the light is on, Press the transmitter twice immediately and the music will lock properly. Plug Type:EU Plug,it applies to Indonesia, Germany, France, Spain, Italy and so on size:15x11.4x7cm Material:ABS colour:black Package Contents: 2 x transmitters (with battery) 2 x receivers (European plug) 1 x pack of screws 1 x please press the doorbell sticker 1 x double-sided tape 1 x instruction manual Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is 1-3cm.