Marshall Guitar amplifier inspired portable speaker， with adjustable bass and treble with maximum sound quality at maximum volume. Compatible with most gadgets in the market. Low power consumption. May use as computer speakers. Best for traveling or outdoors.Product size: 10cm x 12.5cm x 9cm Material: ABS + Metal Power: USB output or battery powered ( Batteries not included ) Maximum output power: 5V Frequency Band: 200 - 15000Hz Sound Pressure Sensitivity: 115dB ± 15dB