With an indicator light, charging interface, and headphone interface, the volume can be controlled. CLEAR COMMUNICATION EXPERIENCE - Omni-Directional Microphone & Electret Speaker delivers crisp, clear sound even in noisy places, showing a meticulous and high-quality sound experience. HIGH QUALITY - Compact and rugged construction, high impact strength. Kevlar Reinforced PU cable and durable coil cord, high tensile strength, and long-life design. Professional electroplated metal pin, Two-pin standard diameter 3.5mm and 2.5mm, space of two-pin 8.6mm, uses electroplating anti-oxidation design, effective to improve the life of the headset, avoid the poor contact situation Can be charged with any USB charger Added power amplifier circuit, Voice is louder and clearer The belt clip can be rotated 360 degrees With one removable 890mAh BL-5B lithium battery Support for external headphonesPackage Includes 1 x HK008 Microphone speaker with adjustable volume 1 x Li-ion battery 1 x USB charging Cable