One of our favorite small packs, the Electric Optics Parallel EL Tape AAA Battery Pack is small on size, yet powers up to 6sqin of EL Tape. When compared to other compact battery packs out there, nothing compares to this unit. Great for costumes, small signs, and more, this little pack is a house favorite! It comes with a constant on/off switch and blink mode. Takes one AAA Battery (not included).