Great 2.5-watt Parts-Only Cigar Box Amplifier Kit You can build your own amplifier! This kit contains all of the parts you need to build a cigar box amplifier - you just supply the cigar box (or other enclosure)! Mount in your favorite cigar box or other enclosure. Pre-wired leads make assembly easy! 2.5-watt Artec amp board produces very respectable sound off of a 9-volt battery On-board Tone/Gain Trim Pot allows fine-tuning of sound. Optional headphones and output jack hookups Circuit works great for amplifying smart phones (adapter cable required).