Doctor Music POP App? This app allows you to use Dr. Music POP of SmartMedical device. Up to 2 units can be interlocked. You can use 4 massage modes, 4 tap mode, and 2 music sync modes. The unit is easily connected and easy to use. This unit uses Bluetooth Low Energy. So you have to turn on the Bluetooth of your smart device and you can connect it directly from the app without any setting. ** Please refer to https://smartstore.naver.com/etimall/products/3914083573 for purchase and detailed inst