With TF card slot, can play Mp3 format files in the TF card. Our portable Bluetooth wireless speaker enables you to wirelessly transmit music from your Bluetooth enabled device and have music anywhere within your home, in your garden or when traveling on your holidays (within 30 metres of your audio device). Portable - Small and light enough to drop into your picnic bag, hand luggage, man bag or even your handbag! Perfect for use in the home, garden, on the beach, picnics and just about anywhere. Great Sounding - Small yet powerful. Having 2 internal drivers and an additional bass driver you'll enjoy the large sound from a deceivingly small package. Rechargeable - No need to worry about batteries, having an integrated high capacity internal battery the portable speaker is easily charged and will give up to 5 hours of continuous use. Features : Bluetooth technology with AUX input. Loudspeaker : 45mm 3W. Working voltage: 3.7V , worked by Lithium battery