Brand BOPMEN Model CC-BC Quantity 1 Color Black Bluetooth Version V2.1 Operating Range 15 meter Compatibility V2.0 / V1.1 / V1.0 Microphone Yes Channels 2.1 Supports Music Format MP3 / WMA Power Supply Built-in Battery Compatible With Cellphone / tablet PC etc. Total Power 3W x 2 Impedance 4 ohm Signal to Noise Ratio(SNR) 85dB Sensitivity 89dB~92dB Built-in Battery Capacity 2200mAh Other Features Bluetooth play: Wireless Bluetooth connection it can quickly and freely connect to Bluetooth devices such as mobile phone tablet PC; Handsfree: Allows you to connect your cellphone with speaker when you receive a phone call no need to use cellphone it will help you to talk with caller directly; Charging: The red LED indicator light will display the status of charging the power source will be shut off as full charge; The speaker will shut down automatically as low voltage; While the electricity of the battery is low the speaker will not be noise; With TF card play: With built-in smart TF card decoding function can play the MP3 format audio files in the TF card; Storage function: Read and write the data in the TF card through data cable directly; Supports Windows XP / Vista / Win 7; Super bass: It has 16 units core dual-magnetic with the long amplitude customize high-quality speakers combined with the low-frequency radiation; The super sound pressure dynamic low-frequency gain and the bass can drive forcefully all these make is superior sound; Double-mode power supply: Supports two mode of power supply connecting with computer in USB or using lithium battery freely choose one of them to supply power for speaker; Quickly charging: The microcomputer of USB power in speaker can automatically and quickly charge for lithium battery the charging time is about 2~5 hours; Earphone output: Can choose 3.5mm jack earphone to listen; AUX input: 3.5mm stereo audio jack input easy to receive all kinds of audio from notebook computer digital music player; Automatically sleep: In the turning on status do not operate it for some time it will voice alarm and then sleep for saving power; Memory play: automatically play the music or the files which was stopper in last time as been shut off power Independent memory function for SD card USB disk and other USB storage device to play music without disturbing to each other; Battery: Lithium battery with 3C certification can continuously play 8~10 hours; Sound system: 2.1 stereo sound channel; Active speaker Adjustable way: Touch; Supports TF card up to 32Gb; Power supply: DC 5V; Interface: Micro USB / TF card slot / 3.5mm jack Packing List 1 x Speaker 1 x 3.5mm male to male cable (77cm) 1 x USB cable (80cm)