Cyrus SoundKey Portable Headphone Amplifier Rose

All 4 colors are available.

Designs and specifications are subject to change without notice. 

General: 
Dimensions (W x H x D), 2.7 x 5.375 x 0.5 inches, 68 x 137 x 12 mm 
Weight, 6.2 oz, 175 grams 
Frequency Response, 20 Hz - 200 kHz 
Audio-in Level, 1 Vrms 
Line-out Level, 1 Vrms 

Recommended Headphone Impedance: 16 Ohm - 300 Ohm 

Maximum Headphone Output Power (Per Channel): 
300 mW into 16 Ohm 
220 mW into 32 Ohm 
30 mW into 300 Ohm 

Headphone Amplifier Output Impedance: 0.5 Ohm 

Output Jacks: 
3.5 mm stereo headphone 
3.5 mm stereo line-out 

Input Ports, Analog: 3.5 mm stereo audio-in 
Digital: USB A for iPod / iPhone / iPad; USB micro-B for smartphones with USB OTG feature and computers. 

DAC Chip: ESS Sabre32 Reference ES9028-Q2M 

Input Format: 
Stereo PCM, Stereo DSD (DoP v1.1 or native) 
PCM Sampling Frequencies, 44.1 kHz  -  384 kHz, 16 / 24 / 32-bit 
DSD Sampling Frequencies, 2.8224 MHz (DSD64), 5.6448 MHz (DSD128), 11.2896 MHz (DSD256, native mode only) 

Profile: 
USB 2.0, USB Audio 2.0 

Included Accessories: 
Power Supply Unit (Rapid Charging Charger) 
USB A - USB micro-B data and rapid charging cable 
USB A - Lightning data cable (for Apple devices) 
USB micro-B to micro-B data cable (for Android and other smartphones) 
3.5 mm - 3.5 mm stereo audio cable 
Silicone rubber band (2 pieces) 
User guide and warranty documents 

Battery:  
Built-in Battery type, 3000 mAh lithium polymer rechargeable battery 
Battery Operation Time, Approx. 13 hours for analog source via Audio-in; approx. 7 hours for digital sources via USB 

Charging Time: Approx. 1 hour 30 minutes