Specifications:  Ultra Lightweight And Portable  Powerful Sound Output with Compact Size  Built-in MIC, So You Can Answers Phone Calls with This Speaker  Multiple Connectivity: Bluetooth / TF / AUX etc.  Smart Chipset Enables Volume +/-, Last/Next Song Function  Provides Play/Pause Function  Suitable In Many Situations: Party / Street / Bedroom etc. Product: Bluetooth Speaker Frequency Range: 60Hz-15KHz Bluetooth Version: 4.2 Rated Power: 10W SNR: ≥50dB Power Supply: Built-in lithium battery 2000mAh Playback Duration: about 8 hours Charging Time: about 4 hours Effective Distance: 10 meters Function: Bluetooth, AUX, Long Standby, TF Card, FM Radio Item Size: 38*13CM Features: Portable Bluetooth Speaker, built-in Bluetooth 4.2 wireless transmission. Support Hand-free when answer calls (with MIC), receive calls. Compatible with all Bluetooth devices such as smartphones, tablet PCs. Bluetooth chip, clear sound and perfect quality, powerful bass and can enjoy unfettered stereo music anytime, anywhere when you are out. Built-in Lithium Battery 2000mAh, support rechargeable battery. Support playing MP3 songs stored in the TF card. Support external 3.5mm audio input terminals of all. Support FM radio function. Package Included:  1 x Bluetooth Speaker 1 x USB Cable 1 x Retail Box