Golden Horse Overdrive Guitar Pedal By Ymuze Moskyaudio. Specifications: Input: 1/4" monaural Jack Output: 1/4" monaural Jack Power Supply: 9V power jack ? DC supply only, center negative and outside positive, no battery connection within. Power Supply does not include. Item Size: 9.3 * 3.8 * 3.2cm / 3.7 * 1.5 * 1.3in Item Weight: 147g / 5.2oz Please note: 1. Due to the lighting effect, the color of the item shown in the picture may be a little different from the real one. It is just for your reference only. 2. The measurement allowed error is +/- 1cm. 3. If you have purchased one item and found it doesn't turn on or there is noise, maybe you could replace a better power supply and try it again, thank you~ Packing List: 1* Effect Pedal Mini electric guitar effect pedal for guitar players. 3 functional knobs(TREBLE/OUTPUT/GAIN) for adjusting the performance of the overdrive effect. True bypass footswitch for switching between overdrive effect and bypass status. LED light for indicating effects or bypass status. Full metal shell and compact size, durable and portable. 9V power jack ? DC supply only, center negative and outside positive, no battery connection within. Power Supply does not include.