This item has been assembled, and electrical test passed.

Best Operating Voltage: +/-9V DC to +/-15V DC.
Gain: 40dB.
Input Impedance: 47K ohm.
Output Impedance: 330 ohm.
RIAA Accuracy: Bandwidth: 20 to 100KHz (-3dB).
Distortion: 0.05% (@1KHz).
SNR: >68dB(use batteries supply).
Size: 100 x 60 x 16mm (L x W x H).

Used high-quality electronic components:
Thickness 1.6mm FR-4 fiber glass PCB (double layer).
HQ terminal blocks easy connection wire.
Polyester film and metallized film capacitors.
Precision 1% metal film resistors.
Ultra low noise and low distortion audio OP AMP OPA2134PA.
Gold-plated OP AMP IC socket, can easily replace other OP AMP.

Module Spec.:
http://www.audiowind.com/pdf/A-300.pdf, No paper specifications, please download this document.

• Best Operating Voltage: +/-9V DC to +/-15V DC.
• Gain: 40dB.
• RIAA Accuracy:
• Bandwidth: 20 to 100KHz (-3dB).
• Distortion: 0.05% (@1KHz).