Description: Upgraded 5.0, faster transmission speeds and more stable connections. Ergonomic,extendable earhook for easy wearing on a wide range of ear shapes,rotatable to fit both ears, won't hurt your ear with extended periods of usage With unique stereo sound quality and CVC8.0 digital noise reduction technology, it has more realistic music. The headset has a battery display, it can be charged at any time, and it is life waterproof that suitable for sports and sweating. Portable storage box, easy to carry and very good for protection. Specification: Model:YYK-520 Size:145 x 81 x 25mm/5.7 x 3.2 x 1.0 inch version: V5.0+ Wireless frequency: 2.4GHZ Support protocol: A2DP1.3/HFP1.6/HSP1.2/AVRCP1.6/D11.3 Transmission distance: 10 meters Battery capacity: 50mAh Charging voltage/current: 5V/1A Play/talk time: about 4 hours Charging time: about 1 hour Standby time: 120 hours Microphone sensitivity: -42Db Working temperature: -10-50°C Charging Case Battery capacity: 400mAh Input voltage/current: 5V/1A Package Includes: 1x Earphone 1x Charging Case 1x Charging Cable 4x Ear Caps 1x User Manual