BT578V3 version: The new model is BT578v3. Compared with the old model, the type-c charging port has been upgraded, and the module has also been upgraded.The power consumption is lower, the mission distance is longer, and high-speed communication is supported. The packaging has also been upgraded.The previous matching charger has been canceled, and you can directly use the mobile phone charger to charge. The red light will go out after full charge!It replaces the traditional serial port cable for wireless serial port mission between RS232 serial port device and computer, mobile phone and tablet Bluetooth protocol: Bluetooth V3.0 (SPP)+Bluetooth V4.2 (BLE) mission power: 5dBmReceiving sensitivity: - 95dBmOptional serial port baud rate: 240048009600192003840057600115200 bpsBluetooth BLE serial communication characteristic value: 0000ffe1-0000-10000-8000-00805f9b34fbMaximum wireless communication distance: 30 metersOperating temperature - 10 - 55 Typical working current: 8mAApplication scenario: Debug switches, routers and other network equipmentConnect total station, level meter, equator meter and other surveying and mapping inst ents to read dataControl the optometer and read the dataData mission of RS232 equipment such as electronic scale, printer, PLC industrial control and equipmentTYPE-C charging interface, built-in large capacity lithium battery, can be fully charged in about one hour, and can be used for about 24 hours when fully charged, or can be directly powered by USBMaterial: plasticcolour: as shown Package Contents:1 x Adapter Kit(Tag Random) 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.