Specifications: Built-in magnets let you attach the two headphones together when not using, and wear like a necklace around your neck, a convenient way to carry around when you don't need them. Ergonomic in-ear headphones design to specifically fit the contours of your ears, and a 10-meter working distance, let you enjoy music when running, gym, sports & exercise and other activities. Bluetooth 4.2 technology, easy and fast pairing with phones, tablets and other Bluetooth enabled music devices and providing high quality stereo sound. Compatible with 99% mobile phone, tablet, Bluetooth-enabled laptop and other digital devices on the market. Support automatic back reconnect, intelligent English voice prompt. Type: Bluetooth Earphone Bluetooth Version: Bluetooth V4.2 Battery Capacity: 75mAh Charging Time: 1.5 Hours Talk Time: 3-4 hours Music Time: ≥5 hours Standby Time: ≥60 hours Charging Input: DC-5V/1A Bluetooth Frequency: 2.402GHz-2.480GHz Bluetooth Distance ≤10m Notes: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Package Includes: 1 x Bluetooth Earphone 2 Pairs of Earbud Caps(Different Size) 1 x USB Charging Cable 1 x User Manual