SpecificationsMemory card type: Micro SD/TF, U disk (not included)Maximum extended capacity: 32GB media format: MP3 total power: 3W Impedance: 4ohmsSignal to noise ratio (SNR): 80dBSensitivity: 15dB +/- 3dBC channels: 2Interface: USB 2.0 / TF / 3.5mm / Mini USB Port FM Radio Power supply: Built-in rechargeable battery Built-in battery: 600mAh Other features: 1.0" LCD display screen Certification: CEFM frequency: 87.5~108MHz Size: 5 * 5 * 5 cm Features Completely clear in sound quality and scratch resistant in characters.FM function: it can automatically search the radio station.Micro SD/TF card slot design: it is able to read data and store music files from inserting of TF card Directly support U disk playback mode: automatically play audio files by inserting U disk or USB connection devices LCD screen: with a small LCD screen to display the working mode. LED indication: Blue light turns on when the speaker is working. Compatible. with all devices with 3.5mm interface.Aluminum alloy shell, durable but stylish.Compact size, multiple colors and attractive appearance.Suitable for indoor and outdoor use.Packing list1 x mini speaker1 x power cable1 x audio cable