1.5″ inch driver and passive radiator. Bluetooth V4.0 audio streaming. 360 degree sound field.Mini size for easy carry. With bottom passive radiator design for springy bass. Directly access TF card.Internal Li-ion battery. Power output: 3W.Driver : 1.5″ full range Neodymium driver. Frequency response : 80Hz – 20KHz. Signal to noise ratio : ≥ 75dB . Separation : ≥ 40dB.  Dimension : W52xD52xH52mm.  Weight : 0.22Kg (net)