FOSTEX D / A converter and headphone amplifier HP-A4BL Output: 32 load output: 100mW + 100mW / 300 load output: 20mW + 20mW / frequency response: 20Hz ~ 80kHz 3dB (at 1kHz, when 32 load, 100mW output) / fit load impedance: more than 16 microSD card slot: corresponding card: microSD card (SDHC) Power: USB bus power / power consumption: 2.5W Dimensions: 113 (W) x 34 (H, excluding foot) x155 (D, including protrusions) mm / body weight: about 500g Japanese / English manual URL (PDF):http://www.fostex.jp/wp/wp-content/uploads/2014/08/HP-A4_Manual.pdf