FEATURES:
Bluetooth 4.1 connection BLE lower power consumption
NFC quick link
aptX superior audio codec: CD quality sound
Analog output: stereo Left/Right RCA
Digital SPDIF outputs: both TOSLINK optical and coaxial
Auto reconnection supported
Link loss reconnection enabled
Low latency fast streaming
Desktop version: plug & play; no battery
Micro USB power port

Specifications : 
Bluetooth version & profile: 4.1; A2DP, EDR
Bluetooth distance: up to 30m
DAC: TI PCM5102A (PCM interface: 32bit/384KHz; SNR: 112dB)
Frequency response: 10Hz ~ 20KHz
AptX low latency: 30ms
Power supply: 5V DC
Optical transmission speed: up to 16Mbps
Optical transmission distance: up to 20m
Dimensions: 7.8 x 7.8 x 2.6cm
Color: black