describe This project is a portable and practical mini digital speaker music player, Fashionable design, compact size And good sound quality, let you indulge in your favorite music anytime, anywhere. feature - Material: Aluminum Alloy. Specification - Battery Type: Built-in 600mAh rechargeable Li-ion battery. - Input voltage: USB DC 5V. - Playing time: about 2-5 hours after fully charged. (The actual playback time depends on the volume of the music). - Music format: MP3 format is supported. - Output power: RMS 3Wx2 THD=10%. - Frequency Response: 150-18000Hz (3dB). - Signal-to-noise ratio: 85dB. - Main interface: 1 * Micro SD /TF card slot, 1 * USB 2.0 interface, 1 * Mini USB power port, 1 * 3.5mm audio input, 1 * 3.5mm audio output. package includes 1 x Mini Digital Speaker 1 x 3.5mm male to male audio cable 1 x USB data cable