Xiankeli Rechargeable S10 Bluetooth Speaker Mini Stereo Speaker with TF Card Slot for iPhone iPad Android Cellphone Tablet PC Mp3 (red) Easy to use and very portable, awesome little speaker , amazing sound . Bluetooth protocol: version 2.1+EDR; ignal-to-noise ratio:&gt;76dB. Talking time: up to 5 hours Working Distance: 40m, Support A2DP,AVRCP,headset,handfree profile 6. Support Hands free with Noise cancellation and echo suppression Support Bluetooth-enabled device: smartphone/ Laptop/ Tablet pc/ /PSP/ MP3/ MP4 Charging time: about 2 hours. Power supply: USB Power