Super long receiving distance， environmentally friendly， energy saving <br>Easy to install without having to seek the help from professionals <br><br>Material: Plastic<br>Color: White + Black <br>Receiver: 10 x 5.8 x 2.8 cm (LxWxH) <br>Transmitter: 8 x 4.5 x 2.3 cm (LxWxH) <br>Receiver button: music selection， volume control<br>Transmitter button: doorbell <br><br>Parameters: <br>Receiver operating voltage: DC 4.5V， 3 x AAA batteries (not included) <br>Working current: not more than 80mA <br>Static current: not more than 0.8mA <br>Power: not more than 2W <br>Music: 36 melody to choose <br>Operating frequency: 315MHZ <br>Volume control: 25-80dB (4 levels to choose) <br>Remote / receiver distance: not less than 100m (open area)<br>Transmitter frequency: 315MHZ <br>Transmitter operating voltage: 12V (battery model: 23A 12V)<br>Transmitter working current: not more than 15mA <br>LED indicator: Press the transmitter button and the LED indicator turns on， transmitter starts working， meanwhile the receiver gets commands and sounds out music to remind you that you have a guest. The LED of receiver flashes along with the music. <br>With water resistance function， it can be installed outdoor <br>Heat resistance: -10°C~50°C <br>1 x Transmitter <br>2 x Receiver <br>1 x Adhesive <br>2 x Screws <br>1 x English manual <br>In paper box<br /><img src="http://img6.eachbuyer.com/x9/p100/eb4041_4.jpg" />                                                        <img src="http://img6.eachbuyer.com/x9/p100/eb4041_5.jpg" />                                                        <img src="http://img6.eachbuyer.com/x9/p100/eb4041_6.jpg" />