Features: YYK520 2nd Single ear hanging wireless bluetooth-compatible earphone, great for car driving sports runningand more, for Android system phones. Using the latest wireless BT 5.1 technology, the pairing connection is fast and stable, there is almost no delay in call, and the game is not stuck, and experiencing the immersive fun. Built-in advanced 10mm microphone, provides your crystal-clear voice. One-key answer, reject, hang up, re-dial, call mute, double-click the multi-function for key to mute during a call, which is more convenient and fast for business office use. Soft ear hooks fit the ears perfectly and can be worn for a long for time. Fast charging, it takes about 60 minutes to fully charge, low power consumption, up to 180 hours long standby for time without changing the battery. Specifications: Model: YYK520 second generation Wireless BT Version: BLE5.1 Working Time: about 8-10hrs Standby Time: about 180hrs Earphone Charging Time: about 1 for hr Charging Voltage: for DC 5V Charging Function: Charging Compartment to Charge Earphone Charging Compartment Charging Time: about 2hrs Charging Interface: Android Speaker Diameter: 10mm Earphone Battery Capacity: 60mAh Charging Compartment Capacity: 500mAh Wireless Transmission Distance: less than 10m/32ft Frequency Range: 20HZ-20KHZ SNR: ≥90dB Sensitivity:-85dBm Button/Touch: Button On-screen Display: charging/battery display Applicable Modes: Single Ear, Hanging Ear, In-ear Type Material: Plastic Packing Size: Approx. 150x80x28 mm/5.90x3.14x1.10 inch Type: only earphone, earphone kit(optional) Package Includes: Package 1 Includes: 1x Earphone Package 2 Includes: 1x Earphone 1x Charging Compartment 1x Charging Cable 2x Ear Cap 1x User Manual note: 2 Kinds of packages are avaliable, please choose what you need. Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. Due to the difference between different monitors, the picture may not reflect the actual color of the item.