Description This loudspeaker is made of high-class materials and can withstand long-term use. Premium and wear resistant metal material, making this amplifier durable and not easily deformed. Fine workmanship and strong practicability. Features -Color: White -Material: Metal -Size: About 9.00X8.40X2.80cm/3.54X3.30X1.10inch -Note: Powered by USB cable -Special design, fine workmanship. It is the best substitute for your old, broken one. -Stable characteristics, high performance, strong reliability, simple operation and convenient installation. -Lightweight, portable design, it is more convenient for you to use this amplifier. -It can be connected to the data line, insert U disk, insert card. -This loudspeaker is suitable for lectures, tour guides, interviews, teaching and other activities. Specification -Distortion rate: 0.03% -Output power: 3W -Rated voltage: ≤36V -Covered space: 1000㎡ -Standby time: 72 hours (10 days) -Charging time: 3 hours -Battery Capacity: 2200mAh Special design, fine workmanship. It is the best substitute for your old, broken one. Stable characteristics, high performance, strong reliability, simple operation and convenient installation. Lightweight, portable design, it is more convenient for you to use this amplifier. It can be connected to the data line, insert U disk, insert card. This loudspeaker is suitable for lectures, tour guides, interviews, teaching and other activities.