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 baudOperating voltage:2.0V - 12VOnboard Chip:NRF51822Actual use distance:The distance to communicate with is about 15 metersFrequency range:2.4GHz2.4 GHz multiprotololl RF receiverARM -M0 32 bit processor256kB flash & 16kB RAM2.0mm seven-pin four-wire connector length:90mmAntenna length:145mmnet weight:3.5gDue to different batches, the appearance, color, and printed words of the product , which does not affect its use.Type:V4Colour:BlackMaterial:composite materialsSize:PCB size:27mm x 13mmPackage Contents:1 * Bluetooth ModuleOnly the above package content, other products are not included.Note: Light reflection 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.