Why its Better choise: 1.True stereo Bluetooth4.1, Good Sound quality, Make you enjoy your music&calling 2.Click buttons to control volume,answer/reject calling,listen music. 3.Smallest size as you can see, also the better sounds quality you can enjoy! 4.Once you connect it with phones, it will connect itself when use next time! Specifications Bluetooth Version: V4.1 Charging time:0.5-2Hour Charging Input:5V Standby Time:5 Months Working Time:32 Hours for comunications,24 Hours listen to songs Wireless Range:10M Color:Sliver,Red,Black,Gold,Sliver Weight:33g Package Included 1*USB cable 1*Bone conduction headphone 1*Manual