DescriptionThisSpeaker is built in 4000mAh rechargeable Li-ion battery for up to about 15 - 20 hours of playtime. Small size lets you easily carry it from room to room, or take it for outdoor parties. What's more, it can also be used as power bank to charger your cell phones. With elegant metal housing design, it fits for using at home, and also loud enough for outdoor party.Features- Color: Black- Material: Metal- Size: 21.3x5x8.2cm / 8.4x2x3.2inch(LxWxH)-Version: 4.0- Battery: 4000mAh- Play Time: 20 hours (50pct volume)- Standby Time: 180 hours- TF Extension: 32G to MAX. (Not included)- Transmit Distance: 10m- Output Power: 10W x 2- Charging Time: 5 hours- SNR: 75dB- Distortion: Less than 0.1pct- Frequency Response: 20Hz - 20KHz- Support Profile: A2DP, AVRCP, HSP, HFP- Frequency Range: 2.4GHz - 2.48GHz- Playback Format: MP3 / WMA / WAV / APE / FLAC- Channels: 2 (2.0)- Input Power: DC 5V 1000MA- Elegant metal housing portable design. Fits at home, and also very loud for outdoor party.- Integrated microphone offers hands-free speakerphone functionality, allows you to enjoy your favorite tunes without missing a call.- Dual high-performance 2.1 design delivers a 20 Watts of room-filling, thrilling audio experience. Greatspeaker for any indoor or outdoor BBQ party.- Easy access to hand free talking / Volume up / Volume down / Fast forward (skip) / Backward / Pause / Play / Power buttons.- Play music directly from cell phone / TF / Tablet PC / USB.