... sd funtion, clear, big sound, have ce fcc cerfication Product features:1:D-80 portable mini amplifier is for teaching with high ... consumption, two advantages of lithium battery electric batteries, use for a long time, could reach 6 hours, with low voltage ... 1 and 2 li-ion battery cells, braces, power adapter, a manual. Second, the technical parameters: Frequency response150Hz-15kHzStandard power10 ...