【Plug and Play】- Wireless doorbell is easy to install and use, all you need to do is connect the receiver to a household power outlet and use the included double-sided tape to install the box of the transmitter outside. Complete the installation in 3 minutes Simple operation, no need to pull the warp, no need to drill the wall 【8 Levels Ultra-Volume Adjustable】-Wireless doorbell uses the most stable music chip in the industry. It can pass through walls better to ensure a more reliable connection. There are 36 songs in the bell to choose from. You can use the music selection button to slide these 36 titles, which can provide 8 volume levels. Press the music button once, the music will gradually increase from level 1-8. 【Wireless Long Range】-Doorbell has 433MHz wireless frequency and super wide range, which won't interfere with other devices in the house. A single sufficient radio rate allows bells to be installed anywhere in the house. It is also an ideal replacement for traditional bells, traditional bells have been fallite and can alert elderly patients and nurses. 【Memory Loss Prevention Function】-Wireless Chime has shutdown memory function, which will memorize volume and selected music before shutdown, so there is no need to worry about the loss of information. In addition, the doorbell uses a low-power design which can save energy and standby for a long time. 【LED Indicator Notify Person】- When the wireless doorbell is connected to 220 AC, the outdoor wifi doorbell will ring the currently selected music and the LED will flash and enter the code pairing mode. If someone press the bell, the doorbell will ring to make sure you don't miss any visitors or packages. Product Description First of all, thank you for choosing our company's wireless doorbell. The wireless doorbell adopts advanced wireless technology. Doorbell host and doorbell can be paired wirelessly. The receiving sensitivity is high, the distance is long, the wireless signal is stable, and adopted the technology of high-quality high-capacity voice processing can accommodate up to 36 music and wonderful. Sound good, the volume is adjustable in 8 levels. Sleek and exquisite design, simple and small, easy to install, plug and play. This product is widely used in homes, cities, farms, office buildings, meeting rooms, hotels, etc. Excellent sound and strong penetrating power. Signals can be received in time even over long distances. Short press the volume button to play the currently selected music and reflect the current volume and flashing LED light at the same time. Short press the music selection button, the music currently selected rings and the LED light flashes. Press the button on the remote control to play the selected music during learning and the LED light flashes. The doorbell has a power-off memory function, which memorizes volume and music selected before shutdown. Tactile music keys and volume keys