Passive isolation, no batteries required Reduces external noise by 26dB. Frequency response 20 - 20,000 Hz Lightweight and durable construction

✔AMAZING Music Playtime/Talk-time -- This bluetooth earbuds is built in 60mAh rechargeable lithium polymer battery that can be used up to 6 hours talking time, 4-5 hours music time, 100 hours standby time on only 45 minutues of Charging. Instantly connected to your smartphone or tablet from up to 33 feet away. ✔Faster and Stable Bluetooth connection -- Our this Bluetooth version has been upgrated 4.1, Instantly connected to your smartphone or tablet from up to 33 feet away. Never lose signal when you when calling, listening music,.ensures maximum signal quality. It will come back very faster to original phone paired automatically even though over 33 feet or more obstacles.Besides, At the same time can be paired with 2 mobile phones. ✔ Ergonomic designed and comfortable to wear -- The wireless headphone is designed Ultra Min with 3 different sizes of ear tips to fit ears of all sizes. Unbelievable Lightweight about 0.1oz. Snug and secure, much more convenient for Driving, Cycling, Running, Jogging, Hiking, Camping, Gym Exercise, Business and Relaxation