Wireless Headset Built-in HiFi Microphone V5.2 for Exercise Fitness Sports Red Description: Wireless V5.2: The V5.2 wireless headset provides a more stable connection, lower latency, faster pairing and universal compatibility, 10 meters long connection. LED display: digital LED display, real-time understanding of the power of the charging case. Hifi Stereo: Built-in high-sensitivity microphone, noise reduction technology, Hifi stereo, allowing you to listen to music, movies or phone calls without distraction. Long standby time: 300MAH charging case, 75MAH headphone battery, long standby time is up to 80 hours, charging box can charge the headphones 3 times. Comfortable to wear: ear hook, comfortable to wear, no strain on the ear canal. Compact and lightweight, easy to carry. Waterproof and sweat proof, suitable for riding, sports, running, training, business and office. Specification: Product Size: Charging chamber: 9,5 cm x 5,8 cm x 2,5 cm/3,74 inch x 2,28 inch x 0,98 inch Headset: 3,9 cm x 4,2 cm x 2,4 cm/1,54 inch x 1,65 inch x 0,94 inch Material: ABS Version: V5.2 Diameter: 14,2 mm Connection sensitivity: 42 dB 3 dB Headphone Distortion: 1K/5 percent Headphone Battery Capacity: 75 MAH Charging box battery: 300MAH Charging box charging times: 3 times Charging box charging time: 3H Talk time: 15H Play music: 10H Frequency Response: 20Hz-20KHz Impedance: 32 Ω Charging Voltage: 5 V Connection distance: 10M Support protocol: HFP/HSP/A2DP/AVRCP/OPP/ The package includes: 2 headsets 1 case with charging function 1 charging cable 1 instruction Note: