Ak120 is composed of a double Cirrus Logic CS4398 digital-to-analog converter - reads the formats: mqs, wav, aiff, flac, alac, ape, mp3, aac, wma, ogg and dff, dsf (dsd64 and dsd128 sacd formats) - 3.31" ultra high definition AMOLED color touchscreen display - double layer avionics aluminum container - unbalanced audio output with combined optical digital output on 3.5 mm minijack (2.1 vrms) - balanced output on 2.5 mm 4-pole minijack (2.3 vrms) - output impedance: 1 ohm for balanced output, 2 ohms for unbalanced output - frequency response: 20 hz - 20 khz +\-0.023 db - signal ratio oise: 117 db - thd+n: 0.0005% - can be used as audio output from the PC via USB - Bluetooth v4.0 - USB connectivity for battery charging and data transfer - 802.11b/g/n WiFi connectivity for streaming, album transfer and firmware updating - internal memory 128 GB, external memory 128 gb - 3.7 V Ly-Polimer batteries (rechargeable) - protective case + micro B USB cable (included) - dimensions (mm): 55 x 118 x 14.9 - weight: 177 g