About the Item: This is a TWS wireless Bluetooth earphone with stereo sound. Wireless in real sense. Feature: 1.Flexible, light weight, comfortable fit and durable design. Best choice when you do sports. 2.Adopt true wireless technology, enjoy your wirelessly sports. 3.Double-ear main and subsidiary earpiece design, innovative and excellence. 4.Intelligent charging box provides fast charge, worry free for endurance. 5.Strong compatibility and compatible with devices as long as they are Bluetooth support. Usage: 1.Long press the power button about 3-5 seconds till you see the indicator light flashes blue and red alternately. 2.Set your phone into Bluetooth mode, and search the device named. 3.Click to pair with the Bluetooth headset. 4.Short press button + / - to volume up/down and Long press button + / - to choose next/previous song. Specification: Item Type: Bluetooth Earphone Color: Black/ White/ Red/ Gold/ Rose Gold Model: TWS Bluetooth Version: 4.1 Model: TWS Impedance: 16Ohms Working Voltage: 3.2V-4.2V Sensitivity: -42db±2db Frequency Range: 2.4-2.48Ghz Distance: <10m Profiles: A2DP/AVRCP Compatibility: Bluetooth Support Devices Package Weight: 0.105kg Package Included: 1 * Pair Bluetooth Earphone +1 case