BT-271 Features: - 2 x 5W speaker with 3" provides high quality sound - Support clock & alarm display function - BT, FM, USB, Micro-SD & line-in input mode - BT V4.1 high-end bluetooth IC provides stable connection with low power consumption - Wooden cabinet with 360 degree volume knob, beautifully designed & convenient - Built-in 1800mAh battery provides 6hrs music playback - Built-in high quality microphone that supports hands-free call Specifications: - BT V4.1 - Driver unit: 5W 4? x 2 - Frequency response: 100Hz-18KHz - S/N ratio: ? 70dB - Battery capacity: 3.7V 1800mAh (Lithium battery) - Working time: 6hrs (at 75% volume) - Charging time: 4hrs - Voltage: 5V - Input current: 600mA - Compatible with Android / iOS / Windows / Mac / Linux OS - Colour: Wooden - Product code: HM-BT-271 - NB: AC adapter not included.