Without uni receiver. Will work with CX2R-G2 without Uni Receiver. 

CXP Wireless Foot Pedal
• NEW! Improved shielding to limit debris getting inside the pedal
• NEW! Better response with one central switch vs multiple contact springs
• NEW! Uses 2 AAA batteries (included) that last 3 years of daily tattooing
• NEW! Spun, anodized aluminum top
• Non-skid rubber bottom
• Easily bagged 
• Can also be used wired with any standard clip cord
• Run as many as you want in one place without interference 
• Compatible with all past and future Critical power supply models
• Dimensions: 5 inch Diameter, 1 inch height, 8.6 ounce weight
• Comprehensive 2 year manufacturer warranty