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% Brand New Material: ABS Color: Black Plug Type: US 100-240V Optional Type: 1*receiver+1*transmitter, 1*receiver+2*transmitter Receiver Power Supply: AC 100-240V Power Consumption: 0.5W Working Frequency: 433MHZ Remote Control Distance: 0~300m(in open environment) Volume: Max.110db(four levels) No. of Music: 52 Size: Approx.82*82*43.6mm/3.2*3.2*1.7in Transmitter Battery: 1 * 23A alkaline battery Size: Approx.74*38.5*15.7mm/2.9*1.5*0.6in Optional Package Weight: Approx.135g/4.8oz or 160g/5.6oz Optional Package List: 1 * Receiver 1 * Transmitter or 2 * Transmitter 1 * Tape 1 * Screw Bag .