LANMU AT-09 Bluetooth 4.0 BLE CC2540 CC2541 Serial Wireless Module Compatible with HM-10 Arduino This small size Bluetooth 4.0 TTL transceiver module allows your target device communicate with your iPhone/iPAD, IOS 6 or Android 4.3 above devices. It's easy to use and completely encapsulated. You can set it as slave or master. You can use AT command set the baudrate. Color: As the picture show. Weight:About 15g.