GRDE application is specially designed for GRDE-BLE (Bluetooth 4.0 low powerconsumption) speaker. It can control GRDE Bluetooth speakers around you.After connecting Bluetooth to the product, you can use APP to control the following items. 1. FM radio turning.2. Realize music play. Choose music lists. Adjust voice and speed.3. Control light. Adjust light brightness. Adjust light color. Turn on and turn off light.APP applies to iPhone models as follows.iPhone 4S, iPhone 5/5S/5C iPhone 6/6plusIOS version: 7.0 or aboveAPP pairing methodWhen you use an iPhone to connect for the first time, you need to connect Bluetooth by using both iPhone itself and APP. Only by doing it this way, the light and music can be controlled at the same time. The Bluetooth connection methods are as follows.1.iPhone: setup / buletooth / turn on. Connect to product. There is a prompt for a successful connection. The device has a voice prompt.2.Open the GRDE Bluetooth APP. Click into the corresponding product. Click Bluetooth/refresh (top right corner). Connect to product. There is a prompt for a successful connection.