EWA A1021 Portable Wireless Micro Mini Bluetooth Speaker With Tf Card for PC / Tablet / Laptop - White Volume controller on the speaker. Allows you to stream music from Bluetooth enabled devices such as cell phones, PDAs, MP3 players, PCs and laptops. Or you can use the 3.5mm audio cable (included) Long lasting - Up to 5 hours of continues playtime using its embedded rechargeable battery Output power - 5W Delivers low frequency resonating sound at even reduced volumes in real time.