How to Use: Press and hold the function key for 3 seconds to turn on, and connect to Bluetooth to use it after turning on. Specification: Item Type: True Wireless Earbuds Material: ABS Model: E10 Colour: Black Function: Audio Conversion and Playback Scope of Application: Most Smart Devices with Bluetooth Bluetooth Version: 5.1 Talk Time: About 3 Hours Transmission Distance: 10 Meters Earphone with Machine Time: About 80 Hours Headphone Charging Time: About One Hour Charging Time for Charging Compartment: About 2 Hours Headphone Built-In Battery: Polymer Lithium Battery Battery Capacity: 30mAh Built-In Battery In Charging Compartment: Polymer Lithium Battery Battery Capacity: 1200mAh Package List: 2 x Earbuds 1 x Charging Cable 1 x Charging Compartment 4 x Earplugs