Completely Clear In Sound Quality And Scratch Resistant In Characters. Fm Function: It Can Search The Radio Broadcast Station Automatically. Micro-sd/tf Card Slot Design: It Is Able To Read The Data And Storage Music Files From Inserting Tf Card Directly. Support U Disk Playing Mode: Automatically Read The Audio Files From Inserting U Disk Or Usb Connection Devices. Lcd Display: With A Small Lcd Screen To Show The Working Mode. Led Indication: Blue Light Lights On When The Speaker Is Working. Compatible With All Devices With 3.5mm Interface. Aluminum Alloy Shell, Durable Yet Stylish. Compact In Size, Multiple In Color And Attractive In Appearance. Suitable For Both Indoor And Outdoor Use. Memory Card Type: Micro-sd / Tf, U Disk (not Included) Max Extended Capacity: 32gb Media Format: Mp3 Total Power: 3w Impedance: 4ohms Signal To Noise Ratio(snr): 80db Sensitivity: 15db +/- 3db Channels: 2 Interface: Usb 2.0 / Tf Slot / 3.5mm / Mini Usb Radio: Fm Radio Power Supply: Built-in Rechargeable Battery Built-in