Output voltage: 7V. Distortion: less than 0.001% Dimensions: 90x49mm height 15mm The capacitors on the board that control the oscillation frequency are and paired using a digital meter. The resistors that control the oscillation frequency are a 3.3K resistor and a 200 ohm 3296 multi-turn potentiometer in series. The pairing is measured and adjusted using a digital meter to the accuracy and low distortion of the output frequency. Note:Due to different production batches, slight differences in appearance accessories not affect the use. Color:Black Material:ABS Package Contents: 1 * Sine Wave Oscillator Circuit Board Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.