Operating voltage: AC (AC) 12V --- 0 --- 12V
work: single-ended class A
Frequency characteristics: 
12HZ ~ 50kHZ (+0 dB,-1dB);
12HZ ~ 120kHZ (+0 dB,-3dB)

Feature:

Voltage Gain: 21dB
SNR:> 101dB
Slew Rate:> 35V/S
Quiescent Current: 240mA
Larger board size: 121x108x35 mm
Zoom board can be used as a preamp can also be used as a headphone amplifier
NOTE: kits only. not a complet board.

Package: 

1 x  Class A Headphone amplifier board