ITEM NAME:ME-28 Bluetooth Headphones Single Ear Aluminum Charging Bin Rotating Stereo X4I2 ME-28 Bluetooth Headphones Single Ear Aluminum Charging Bin Rotating Stereo X4I2 Model: TWSEJ04LS Wireless connection: Bluetooth 5.0 Communication distance: 10 meters (accessible open environment) Working time: About 4 hours Standby time: About 150 hours Single earphone battery capacity: 40 mAh Charging box battery capacity: 300 mAh Headphone charging time: Approximately 1.5 hours Charging box charging time: About 2 hours Colour: Black Material: Aluminum alloy Package Contents: 1 * Bluetooth Earphone 1 * charging cable 1 * Charging bin 1 * Instruction manual