Specifications:

Supported Audio Formats: WAV, FLAC, WMA, MP3, OGG, APE (Normal, High, Fast), AAC, ALAC, AIFF, DFF and DSF
Sample Rates: FLAC/WAV/ALAC/AIFF = 8 kHz~192 kHz (8/16/24 bits per sample); DSD64 = 1-bit, 2.8 MHz, stereo; DSD128 = 1-bit, 5.6 MHz, stereo
Output Level: Unbalanced = 2.1Vrms; Balanced = 2.3Vrms (Condition No Load)
DAC: Cirrus Logic CS4398 x2 (Dual DAC)
Decoding: Support up to 24bit/192kHz Bit to Bit Decoding, DSD64/DSD128
Input: USB Micro-B input (for charging & data transfer via PC & MAC)
Connection Mode: MTP (Media Device)
Outputs: PHONES (3.5mm) / Optical Out (3.5mm) / Balanced Out (2.5mm, only 4-pole supported)
Wi-Fi: 802.11 b/g/n (2.4GHz)
Bluetooth: v4.0
Dimensions: 2.59 "(66 mm) [W] x 4.21 "(107 mm) [H] x 0.68 "(17.5 mm) [D]
Weight: 6.5 oz (185 g)
Frequency Response: ±0.023dB (Condition: 20Hz~20kHz) Unbalance & Balance / ±0.3dB (Condition: 10Hz~70kHz) Unbalance & Balance
Signal to Noise Ratio: 116dB @ 1kHz, Unbalance / 117dB @ 1kHz, Balance
Crosstalk: 130dB @ 1kHz, Unbalance / 135dB @ 1kHz, Balance
THD+N: 0.0007% @ 1kHz, Unbalance / 0.0005% @ 1kHz, Balance
IMD SMPTE: 0.0004% 800Hz 10kHz(4:1) Unbalance / 0.0003% 800Hz 10kHz(4:1) Balance
Output Impedance: Balanced out 2.5mm (1ohm) / PHONES 3.5mm (2ohm)
Clock Jitter: 50ps (Typ)
Battery Capacity: 3,250mAh 3.7V Li-Polymer Battery
Built-in Memory: 256GB [NAND]
External Memory: microSD (Max 128GB) x1
Display: 3.31inch WVGA (480 x 800) AMOLED Touchscreen
Feature Enhancements: Firmware upgrades supported (OTA)

Astell & Kern AK240 Gold Limited Edition High-Resolution DAC Audio Media Player