2961 wireless headphones use BT V5.0 technology, delivering high speed and stable transmission. It has multiple playback modes, such as BT connection, and 3.5mm audio cable, allowing you to enjoy endless music. Foldable and adjustable headband length, soft ear cushion, easy for storage, and comfortable to wear for a long time. Also, built-in microphone enables hands-free calls, delivering clear and real talking sound. Model Number:P2961 BT Version: V5.0 Operation Range: 10 Meters (no obstacle) Speaker Unit: 40mm Frequency Response: 20Hz-20kHz Impedance: 32 Sensitivity: 113+/-3dB Music Time: 6 - 10 hours Charging Time: about 2-3 Hours Charging Port: Micro USB Packing list: 1 x Bluetooth headphone 1 x Charging cable 1 x 3.5mm audio cable 1 x user manual