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Kindly note: If you have any question after you receive the item , please contact us first before opening dispute and leave a comment, much appreciate * Play Time: About 6h * Standby Time: About 240h * Headphone Charging Time: about 2h * Headphone Battery Capacity: 30mAh * Charging Voltage: DC 5V * Charging Port: Type-C Charging Port * Bluetooth Headset Transmission Distance:10m * Frequency Range: 20HZ-20KHZ * Material: ABS+PC * Instruction: Chinese/English * Signal-to-Noise Ratio:90DB * Key/touch: Smart keys * Color: Black/White/Khaki * Charging Line Length: 200MM * Low Power Reminder: Voice Feature: * IPX5 Waterproof and Dustproof * High Capacity Battery * HD Voice * HiFi Sound * LED Display Package Included: * Color Box Packaging * 1 * Charging Bin * 1 * Headset * 2 * Instructions * 1 * Charging Cable * 1 FAQ: Q: What should I do if the earphones doesnt connect to my device? A: Please delete the connection record and reconnect it with the mobile phone. Q: What should I do if one earbud have no sound while the other one is normal? A: This situation should be due to two earphones not pairing successfully. Two MD or MD528 models will appear in the Bluetooth settings. You need to open the Bluetooth in the phone settings, delete the previously paired MD528 or MD, put the earphones back into the charging compartment, and wait for the two earphones to display charging. Take out the two earphones, press one of them twice continuously, and manually pair them. When there is only one MD528 or MD Bluetooth model in the Bluetooth settings, You can connect again