Product Description: Makeblock Bluetooth dongle is a BT4.0 (low power consumption) interface converter for Bluetooth devices that is designed mainly for short-distance wireless data transmission. The dongle can pair with any Makeblock devices with built-in Bluetooth modules, which offers users a smoother wireless experience. Features: 1. USB interface, plug-in directly to achieve Makeblock Bluetooth wireless programming device; 2. Only for Makeblock Bluetooth devices'3. High transmission efficiency, low latency data transmission;4. No cable needed,easy to carry and use;5. Technology is more mature and the signal is more stable. Specifications: Bluetooth: Bluetooth 4.0 Host interface: USB 2.0 Power Supply: 5V Output Power Class: Max. 4dBm Receiving Sensitivity: -90dBm Working Frequency Band: 2.4GHz-2.48GHz unlicensed ISM band Battery: AA battery Transmission distance: 15m(standard distance of Bluetooth device) Part List: 1 × Bluetooth adapter