KOCASO Hamburger Mini Speaker includes 3.5mm Audio Jack, Audio Sound Amplifier - Black MINI SPEAKER - Mini Speaker designed for sound quality, portability through its miniature size, and easiness of use. BUILT IN BATTERY - Built-in high capacity rechargeable battery, supports long time use. WORKS FOR HOME, TRAVELING OR COMPUTER - Perfect for both home and travel. Good for playing music or sounds from your computer. 3.55 MM AUDIO JACK - Mini speaker supports connection with 3.5mm audio jack for devices without Bluetooth. Speaker can be expanded to enhance sound quality. INDSUTRY LEADING CUSTOMER SUPPORT - You can continue to rely on Electro-Deal to offer the markets most competitive prices, paired with industry leading customer support, and all backed by a one year, full manufacturers warranty on new products or a 90 day limited warranty for refurbished products!