[NEW VERSION] Amzdeal Bluetooth Earphone Bluetooth Headphones Lightweight Wireless Bluetooth Earbuds Sport Bluetooth Earpiece Noise Cancelling Headphones for Jogger, Running, Sport, Gym Exercise Bluetooth 4.1 technology,the signal strength is nearly twice times than the general bluetooth headset in the market. Awesome portable and lightweight wireless headset can be stay in your ears comfortably. The latest advanced Bluetooth 4.1 technology+A2DP Wireless Stereo Headset Sport Earphone headphone. Moreover, this item has the best Audio Performance. It can offer you high voice quality and is perfectly suitable for sports such as running, mountain-climbing, etc. Charging time: about 2.5 hours; Micro USB port for battery recharge; Operating distance: up to 10m (free space); DC battery power: built-in rechargeable lithium battery; Talking/music playing time: about 10 hours Tight and light for more comfortable wearing. Superior sound isolation by silicone eartips, ergonomically designed to provide comfort in your ear.