(1) bluetooth v2.1+edr (2) support hfp, a2dp, avrcp (3) support 5 hour playback time at 70% volume (4) wireless transmission range up to 10m (5) support line in and tf card Power supplier:, dc5v Output power:, 3w(1khz, thd1%) Frequency:, 280hz-- 16khz Signal&noise ratio:, ¡y95db Impedance:, 4 ohm(|) Li-ion output:, 3.7v~4.2v+0.05v Li-ion input:, 5v Lithium battery:, 450mah Speaker unit:, dia 45 Case material:, abs Dimensions:, 75*75*42.6mm Weight:, 149g Color:, oem Neutral packing or customzed packing