CRITICAL WIRELESS FOOT SWITCH White Tattoo Ink it will also work with

it will also work with any Power Supply that has a phono plug connection or you can use this adapter  to plug this foot pedal into a regular tattoo power supply with a 1/4″ power supply foot pedal jack

especially tattoo kits on Ebay that include bottles that look like this brands bottles

botanical-based RED Needle Cleaner

depending on how you adjust it

Colbalt Blue

CRITICAL WIRELESS FOOT SWITCH White Tattoo Ink it will also work withThe Critical Wireless Foot Switch works together with Critical Universal Receiver to be utilized with any power supply with a standard 1 4foot pedal jack. Note this Critical Wireless Foot Pedal must use the Critical Universal Receiver in order to work. * Improved shielding to limit debris getting inside the switch* Better response with one central switch vs multiple contact springs* Uses 2 AAA batteries (included) that last 3 years of daily tattooing*