The PEMF 300 Pro Tote is a Solid State Digital unit. It is the strongest of all the Solid State units on the market today! It is ready for 110v USA or 220v International power requirements. It incorporates a Parallel Pulsing System, meaning it utilizes a Low Powered 10 micropulses per second (the same as the earth’s frequency) as well as a High Powered PEMF pulsing at the same time! Easy control, up and down arrow for intensity levels 1-10 on either side and a timer level of 5 minutes OR 10 minutes. It is ready for 110v USA or 220v International power requirements. Safety tested and ready for use. Safety tested and ready for use.