Engineered in collaboration with Critical, the PRIME Pen was designed with a custom precision Bishop motor made in Japan. Versatility meets excellence with easy-swap magnetic battery connection and is compatible with most cartridge brands. The FULL SET includes 1 x Magnetic RCA Converter, giving you universal connection to any RCA machine. ​Are you looking to buy the machine only? Check out the PRIME x Critical Pen Machine Single Set.   Features • Reliable custom Bishop motor made in Japan• Easy-swap magnetic battery connection• Battery compatible with the Critical Docking Station• Compatible with PRIME Pen Disposable Grips• Voltage range - 4.5V - 13V• Available in 3.5mm and 4.2mm Stroke• 1-year Warranty• Jumpstart on/off: Activate Jump Start mode if the needles are not moving when you turn on the machine. Bundle Info Full Set includes: (1) Critical x PRIME Pen Machine (2) Critical x PRIME 2000mAh Batteries (1) Critical 2-port Docking Station with 6-ft USB-C Charging Cable (1) RCA Converter (1) 34mm/1.3in PRIME Disposable Grip (1) PRIME Cartridge Sample Set: 5RL, 7RL, 9M, 9CM (1) PRIME Tool (to access inner plunger bar/maintenance) ​ Critical x PRIME Pen Manual download ​ How to Maintain your Machine VIDEO TUTORIAL: https://www.youtube.com/watch?v=ph1mgxmpoZg