1、BT function, just take the earphones out and they will automatically connect to each other. 2、One-key operation to control calls, music,volume and voice assistant. 3、Small size recharging box, it will recharge the earphones automatically and power-off when fully charged. This pair of cordless mini earphones are equipped with BT5.0 chip. Auto pairing and one-key operation. It brings you high-fidelity sound and high-definition communication. Features: BT function, just take the earphones out and they will automatically connect to each other. One-key operation to control calls, music,volume and voice assistant. Small size recharging box, it will recharge the earphones automatically and power-off when fully charged. IPX5 sweatproof waterproof. No need to worry about sweating during exercise. BT5.0 chip, long transmission distance, high anti-interference ability, low power-consumption. Scientific shape design in accordance with human ear. Comfortable to wear and not easy to drop. Noise cancelling and high-fidelity sound quality. It brings you nice listening experience. Specifications: Item Colour: Black, Red(optional) BT Version: Ｖ5.0 Frequency :2.4~2.48GHZ Standby: ≥40 hrs Working Hours: ≥2 hrs Recharging Hours: ≤2 hrs Communication Distance: ≤10 meters Package Size: 122 * 94 * 40mm / 4.8 * 3.7 * 1.57in Package Weight: 175g / 6.17oz Packing List: 2 * Earphones 1 *Charging Box 1 * USB Cable 1 * User Manual 2 * Earphones 1 *Charging Box 1 * USB Cable 1 * User Manual