BT578 Serial Bluetooth adapter is usually connected to a serial device by DB9 serial port, and then communicates with a mobile phone or a computer via Bluetooth SPP or BLE, and thus build a wireless link between the serial device and the computer or mobile phone. It can your conventional RS232 serial cables, connects communication both sides over the air, provides a wireless serial connection with more freedom and convenience. Bluetooth dual mode: Supports Classic Bluetooth Serial Port Profile(SPP) and Bluetooth LE(BLE). Could be connected to a computer or Android phone via SPP, or an Android or iOS phone via BLE. Lower power consumption than BT578_V2, but longer communication distance. Using the current popular Type-C interface for Power supply and charging. Can be connected to female or male serial port device by DB9 connector or converter. A green LED is used to indicate TX/RX activity of RS232 serial communication. Supports Pin 9 power supply, just connect pin9 to 4~6V and pin5 to GND. Built-in battery and charging circuit, more than 24 hours battery usage time. Supports AT setting on computer to personalize name, baud rate, etc. Specification Standard: Bluetooth v3.0(SPP) + Bluetooth v4.2(BLE) Selectable Serial Baud Rate: 1200,2400,4800,9600,19200,38400,57600,115200 bps Serial Communication BLE Characteristic: 0000ffe1-0000-1000-8000-00805f9b34fb Typical Bluetooth Coverage: 30 meters (line of sight) TX Power: 5dBm RX Sensitivity: -95dBm Typical working Current: 8 mA Dimension and Weight: 78x34x16mm 30g Material: Plastic Color: As shown Package Contents: 1 x Bluetooth module Only 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.