1.HIGH-FIDELITY SOUND:The bluetooth headset use latest 4.1 CSR, filter technology and copper ring horn, intelligently filter noise and cancel echo, deep bass and crystal clear treble. Making the bluetooth headset have unparalleled crisp stereo sound quality during calls and listening. You've never heard so good sound of sports headphones! 2. SUPER QUICK PAIRING - Headset that work with all smartphones, tablets and music players. Latest Bluetooth 4.1 technology; easy and fast pairing with smartphones, tablets and other Bluetooth enabled music devices; aptX codec provides pure, CD-like high quality sound for compatible devices.Bluetooth range in the open space is 10M/33 Feet.It can be connected with two devices simultaneously. 3.LONG STANDBY TIME - Up to 4-6 hours talking/playing,150 hours standby.You can focus on your favorite music, make a phone call ,voice chat,hands-free. No matter where you are.You always have a sincere accompanied around you.Perfect workout headphones that are snug and secure so the headphones stay put while Gym, Running, Jogging, Hiking, Cycling, and impact Sports. biking or at the gym. 4. COMFORTABLE SECURE FIT - Package 3 different sizes of ear-hook and ear-tips kindly for different shape of ear.Stay in ear easily.Pls read the instruction when you use it. Bluetooth Version: 4.1 Bluetooth protocol: A2DP,AVRCP Bluetooth mode: Hands free,Headset Talking Time: 4-6 Hours Audio: Stereo Color: Black 0.118 Package weight: 0.147 kg Product size (L x W x H): 10.30 x 12.00 x 4.50 cm / 4.06 x 4.72 x 1.77 inches Package size (L x W x H): 10.30 x 12.00 x 4.50 cm / 4.06 x 4.72 x 1.77 inches Package Contents: 1 x Bluetooth Earbuds,1 x USB Cable,3 x Ear Caps,1 x Wire Clip,1 x User Manual,1 x Storage Box