Specifications - Type: Bluetooth Audio Receiver - Item Color: Black - Bluetooth Version: V 3.0 + EDR, class 2 - Frequency Range :2.4GHz - Profile: A2DP Transmission - Range: Up to 10m / 33ft - I/O 3.5mm female plug, Mini USB female port - Power Supply: DC 5V - Charge Time: About 30 min - Working Time: Up to 8 hours Package: - Bluetooth audio receiver - 3.5mm to 3.5mm adapter - USB charging cable - English user manual