Features:The farthermost wireless effective distance can reach 300m adopting imported precision electronic materials in combination with specific long-distance technology.Built-in stable music chip loads 52 melodious ringtones, making the premium speaker output a pure and high-decibel chord music.Top design style of Europe and America presents a simple, stylish and elegant appearance.Digital dual-panel circuit design, ensures stable operation, strong and reliable performance.Adjustable four-level volume can meet the needs of different environments and different volumes.Transmitter remote control button has a long life service for 25 years if pressed 5 times once day.User-friendly package list with tape and a bag of screw, allows users to install without extra accessories.Suitable for homes, apartments, villas, hotels, offices, elderly care, hospitals, and etc.Configuration Method:Pairing: Press and hold the receiver volume button for 3 seconds, wait for the light to be on. After long bright, press the transmitter to complete the pairing.Unpairing: Press and hold the receiver volume button while plugging in the power. After about 8 seconds, release when the indicator light keeps on, and all the pairing information in the device will be cleared.Specification:Condition: 100% NewMaterial: ABSColor: BlackPlug Type: US 100-240VOptional Type: 1*receiver+1*transmitter, 1*receiver+2*transmitterReceiverPower Supply: AC 100-240VPower Consumption: 0.5WWorking Frequency: 433MHZRemote Control Distance: 0~300m(in open environment)Volume: Max.110db(four levels)No. of Music: 52Size: Approx.82*82*43.6mm/3.2*3.2*1.7inTransmitterBattery: 1 * 23A alkaline batterySize: Approx.74*38.5*15.7mm/2.9*1.5*0.6inOptional Package Weight: Approx.135g/4.8oz or 160g/5.6ozOptional Package List:1 * Receiver1 * Transmitter or 2 * Transmitter1 * Tape1 * Screw Bag