Our compact Bluetooth speaker packs a punch with sound quality that is far superior to many competitive three-watt pop-up speakers. Our unique "Yo-Yo" design gives our speaker a parabolic shape allowing better sound quality. Plus, you have the option of connecting via Bluetooth or via line-in cable. Less that 1.8 inches high when collapsed, our speaker easily fits into a coat or backpack pocket for super portability. With a 500mAh lithium ion rechargeable battery, you'll get five to nine hours of play time (depending on volume) from one charge.