Features:<br />Classic A circuitry? a flip of the switch gives you up to a 35dB boost.<br />Supports a maximum input of 18V DC voltage.<br />The pedal can also function as a volume limiter.<br />The sound of the Roll Boost pedal is transparent? and the gain knob fully functional toadd some sparkle and a slight boost.<br />Features True By-Pass Wiring.<br /><br />Specifications:<br />Model: JF-38<br />Color: Yellow<br />Material: Aluminum alloy<br />Input impedance: 1M?<br />Output impedance: 1K?<br />Running current: 2mA<br />Power: 6F22 9V battery / DC 9V adapter (Neither included)<br />Item size: 11.7 * 6.7 * 5.1cm / 4.6 * 2.6 * 2.0in<br />Item weight: 180g / 6.3oz<br />Package size: 13 * 7.5 * 6.2cm / 5.1 * 2.9 * 2.4in<br />Package weight: 220g / 7.7oz<br /><br />Package List: <br />1 * Effect Pedal<br />1 * User Manual (English &amp; Chinese)<br /><br />Note:<br />This unit is without battery? put on the battery by opening the back cover with ascrewdriver.<br><img src="http://img.tomtop.com/product/xy/2000/2000/p/tt/i/2/i288-8-ae3e.jpg" /><br>$$<img src="http://img.tomtop.com/product/xy/2000/2000/p/tt/i/2/i288-5-ae3e.jpg" /><br>$$<img src="http://img.tomtop.com/product/xy/2000/2000/p/tt/i/2/i288-1-ae3e.jpg" /><br>$$<img src="http://img.tomtop.com/product/xy/2000/2000/p/tt/i/2/i288-9-ae3e.jpg" /><br>$$<img src="http://img.tomtop.com/product/xy/2000/2000/p/tt/i/2/i288-7-ae3e.jpg" /><br>$$<img src="http://img.tomtop.com/product/xy/2000/2000/p/tt/i/2/i288-6-ae3e.jpg" /><br>$$<img src="http://img.tomtop.com/product/xy/2000/2000/p/tt/i/2/i288-4-ae3e.jpg" /><br>