The wireless earphones can connect to BT devices automatically, the hands-free design is convenient for you running or walking. With the mini box and charging cable, it is easy to charge for earphones. Features: In-ear design, the ear-hook fits for your ear and brings you comfortable experience for running. Microphone and voice prompt, call and music never missing. Pause the music and play back automatically when receives a call. Call transfer between the headset and BT mobile phone. Automatically connects to the last connected BT device. Music BT headphone charging via Micro USB. Phone power display, you can always watch the situation of power. Specifications: Material: ABS Color: Red, Gold, Rose gold (optional) BT Version: V4.2+EDR Transmission Distance: Single 12 meters, one pair 10 meters (without cover) Speaker Impedance: 32 ohms Battery Capacity: Headphones: Single 3.7V/50mAh Charging Box: 3.7V/550mAh Operating Temperature: -10~55℃ Charging Time: Headphone: 1~2 hours Charging Box: 4~5 hours Play Time: Single about 4 hours, one pair about 2 hours Standby Time: Single about 100 hours, one pair about 50 hours Package Weight: 111g / 3.92oz Package Size: 10 x 10 x 3.4cm / 3.94 x 3.94 x 1.34in Package List: 2 x Earphones 1 x Box 1 x USB Charging Cable 1 x User Manual