Check the listing for details. HM-10 BLE Bluetooth 4.0 CC2540 CC2541 Serial Wireless Module Arduino Android IOS. Condition: New. Listed at 9.99 USD. Product Information HM-10 BLE Bluetooth 4.0 CC2540 CC2541 Serial Wireless Module Arduino Android IOS Click on the Image to Enlarge zoom_in Features: CC41 BLE Bluetooth 4.0 UART Transceiver Serial Module, with low-power dissipation, uses the U.S. TI's CC2541 chip configuration 256Kb space, and follows the Bluetooth specification V4.0 BLE. Supports AT commands; the user can modify the serial port baud rate, device name, password and other parameters according to the pair. The module supports UART interface, and supports Bluetooth SPP serial protocol. Connected with Iphone 4S and Android 4.3 above. The most complete, most convenient, and most stable Bluetooth data transmission, remote control,and data acquisition module. Master-slave in one, transparent transmission, replacing serial port. Remote control, Remote data acquisition, transparent transmission, MCU is unnecessary. Bluetooth protocol: Bluetooth Specification V4.0 BLE, receive no byte limit, Iphone 4s under open environment Operating frequency: 2.4GHz ISM band Modulation: GFSK (Gaussian Frequency Shift Keying) Sensitivity: