Specification Bluetooth Version: 4.2 Connection Range: 33 feet (10 meters) Talking Time: 30 hours Playback Time: 30 hours Charging Time: 2-3 hours Standby time: up to 500 hours Charging Voltage: 5V Battery Capacity: 3.7V/500mAh Li-polymer battery Spotlight: 1. 2 in 1 design: bluetooth 5.0 as wireless mode, up to 30 hours long time playing, even with no battery, can be use the cord as wired mode listening music whenever and wherever. 2. Super ergonomic design, for product itself only 113g, can be for wear a day with no uncomfortable or pain, the cushion is imported from Germany, breathable and skin-friendly. 3. Upgraded bluetooth version 5.0, for more stable and quickly data transfer, and power consumption. 4. Driver unit up to 40mm, and built-in microphone for handsfree call, crystal sound you will be enjoy when chatting with others. 5. CVC 6.0 noise cancelling function, to avoid noise in your life, give you clear sound from call or chatting 6.Retractable steel headband to fit your ear more comfortable, on headset with volume control button, easy to adjust volume when move away, next track or previous track also can be adjust . Packing List 1 × EKSA E100 Bluetooth Headset 1 × 3.5mm Audio Cable 1 x Micro USB Charging cable 1 × User manual