Specifications: Bluetotoh Version: Bluetooth V4.1 Chip: CSR8635 Noise Reduction： CVC 6.0 Sweatproof Rating: IPX4 Support: A2DP, AVRCP, HFP, HSP Working Distance：≤33ft/10m （Barrier-free） Frequency Range：2.4026GHz – 2.480GHz Charging Time：about 1.5 Hours Talk Time：about 4-6 Hours Music Time：about 4 Hours (Note: Playtime varies according to the volume level and the audio content) Standby Time: about 120 HoursAdvanced CompatibilityBluetooth headphones featuring the latest Bluetooth 4.1 technology ensures faster & stable signal transmission, clearer HD sound quality and lower power consumption. The wireless bluetooth headphones can easily and quickly connect with most Bluetooth enabled devices such as iPhone7/7 Plus, 8/8 Plus, X, iPad, iPod touch, Android Samsung Galaxy S7 S8 S9 Note 8 Smart Phones, tablets, etc.IPX4Sweat proof technologyIPX4 sweatproof design fully protection of your headphones from sweat, rain and other wet environment damage.Great ConversationFeatured with CVC6.0 noise cancelling technology, this wireless headphone filters out background noise to provide you with high quality, hands-free phone conversation even on the street or inside shopping mall.Convenient In-line ControlsPlay/ pause your music, or change the volume all from the headphones with reliable multi-button inline controls. You can even activate Siri or answer calls with just a touch of a button.