LIMTECH&reg; Bluetooth music receiver S10 wireless mini bluetooth speaker With USB For Smartphone support answer calling and TF card (Black) 1.Support all Bluetooth editions,10 meters remoter control scope,wireless communication(consistent with the Bluetooth protocol specifications CLASS) 2.Bulit-in lithium battery:3.7-4.2V,can use USB to connect your computer to charge,or USB power supply of DC5V,the charger light will turn red and when charging is completed,the red light will disappear. 3.Bluetooth version:2.1+EDR 4.Bluetooth protocol:Support A2DP and AVRCP profile. 5.Works with iPod,iphone,Mobile phone,computer etc.