Malloom Foldable Easy Storage Wireless Bluetooth Headphone Stereo Earphone fo... Operation distance: 10m Bluetooth version: ISSC3.0 Rechargeable lithium battery: 300mAh Playing time up to 10 hours, and continue talk time up to 7-8 hours, standby time up to 120 hours. Charged via USB, rechargeable battery, convenient and practical.