GATTBrowser is a free Android application developed by Renesas that allows you to discover and communicate with Bluetooth Low Energy (LE) devices. With a specialized function for Renesas Bluetooth LE microcontrollers, it is the best general-purpose app for communicating with these devices. The app scans the surrounding Bluetooth LE devices, displays the advertising data, and provides the Received Signal Strength Indication (RSSI). It also offers the ability to connect to Renesas Bluetooth LE microcontrollers and other Bluetooth LE devices. The app displays the BD address of the connected Bluetooth LE device and shows the services and characteristics information. It also supports Renesas custom services and characteristics.