Compact headphone amplifier with Bass Boost function, that turns listening to music into a true audio experience. It has a durable metal body, output power 120mW x2 (16 load) and 13mW x2 (300 load), headphone impedance of 16 ~ 300 and a frequency response of 10Hz ~ 100KHz. It can be charged via USB or micro USB inputs and has a headphone jack output. It includes a handy clip for easy attachment to clothing. Dimensions: 57 x 27.6 x 9.10 mm. Weight: 18 g. Color: Black.