VIKEN Wireless Bluetooth Sports Headset Headphone Handsfree Wireless Stereo with Mic for Running for Smartphone,PC Red Wireless Bluetooth stereo headphones for streaming audio from compatible mobile phones,PC,laptop,tablet and MP3 players Frequency response: 20Hz-20KHz Portable, lightweight, sporty design, sport, leisure, offices are free to listen Talking time: upper limit of approximately 10 hours