Kindly Reminder: This bluetooth module can only support Android mobile device. Used to communicating between the and Tool (mobile) over BLE. Note that the UART port on the must be enabled with a baud rate of 115200 for this to work. The UART port on can work only under 115200 baud Operating voltage: 2.0V ~ 12V Onboard Chip: NRF51822 Actual use distance: The distance to communicate with is about 15 meters Frequency range: 2.4GHz 2.4 GHz multiprotololl RF receiver ARM Cortex-M0 32 bit processor 256kB flash & 16kB RAM PCB size:27mm x 13mm 2.0mm seven-pin four-wire connector length:90mm Antenna length:145mm net weight:7g Type: Suitable for V4 Colour: Black Material: composite material Package Contents: 2 x Skateboard Bluetooth Module Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.