Product description Colour Name:Black ✐Headphone type: head-mounted ✐Color classification:black,gold, red ✐Bluetooth version: V4.1 ✐Bluetooth range: 10m ✐Support: HSP, HFP, A2DP, AVRCP ✐Channel: bilateral stereo ✐Standby time: 16 days ✐Charging time: 3 hours ✐Listening to song time: 24 hours ✐Charging voltage: DC 5V ✐Battery capacity: 500mAh / 3.7V ✐Whether to support wired: support ✐Package includes: headphones, USB charging cable, audio cable, headset package, user manual Note: ★The Bluetooth headset can easily and quickly connect with smartphones, tablets and other Bluetooth devices within 33 feet. 1. If you can't connect this headphones to your cell phones or other devices, please ask us for a complete FAQ guidance of Bluetooth Headphones, you can find the solutions finally! 2. It also can connect to your PC via Bluetooth transmitter. Please make sure the driver software of receiving adapter is fully updated when connected to PC or laptop.. ★Please adjust the volume of your phone when you still feel not loud enough even you've reached the highest volume on the headset. ★Please charge your headset every month to prevent excessive battery discharge.