Flexible, secure-fit earhooks maximize comfort and stability – with an unique design for athletes, confortable and secure fit •Sweat resistance and durable – with rubber coating to keep sweat out •Dynamic, strong Bass signature sound – with great bass performance and good sound quality •3 button remote and microphone, easy control box for music playing •3 sizes of ear hook, create personalized and optimal fit earphone •Works with iOS and Android bluetooth devicesBluetooth Version V4.1 Bluetooth Profile HFP v1.6 wideband speech (HD voice ready), HSP v1.2, A2DP v1.2, AVRCP v1.4, Apt-x Frequency response 20Hz – 20KHz Charging Voltage DC 5V Battery Type Rechargeable Li-Polymer 60mAh Music mode 4 hrs Talk Time 5 hrs Standby Time 150 hours Charging Time 1.5 hours Charging Input Port Micro USB Color Black