Kindly Reminder: This Bluetooth module is compatible with Android mobile devices only. Used for communication between the tool and mobile device via BLE. Note that the UART port must be enabled with a baud rate of 115200 for proper operation. The UART port operates only at 115200 baud rate. Operating voltage: 2.0V - 12V Onboard Chip: NRF51822 Effective communication distance: up to approximately 15 meters Frequency range: 2.4GHz 2.4GHz multiprotocol RF transceiver ARM-M0 32-bit processor 256kB flash and 16kB RAM 2.0mm 7-pin 4-wire connector, cable length: 90mm Antenna length: 145mm Net weight: 3.5g Due to different production batches, the product's appearance, color, and printed markings may vary slightly, but this does not affect functionality. Type: V4 Color: Black Material: Composite materials Dimensions: PCB size: 27mm x 13mm Package Contents: 1 x Bluetooth Module Note: The package includes only the items listed above. Other accessories are not included. Note: Lighting conditions and display settings may cause slight color variations between the product image and the actual item. Measurement error allowance: +/- 1-3cm.