Burr Brown PCM5102 DAC (max 24/96).
OpAmps are OPA1652 and there's sufficient grunt to drive up to a 600ohm headphone.
Has both optical and USB inputs. Apparently (if translation is correct), no CCK is required for iOS support but uncertain if Teac's iOS HR Audio Player is required. It also supports Android (AOA2.0).
There's also a Line In to use it as just an amp.
The 2100mAh battery life lasts up to 8 hours which can be charged via USB (despite having a 5V DC in port?).
The price is 28,140 Yen (approx ~USD$278.53)
credit : AnakChan