The T-ONE EVO I is a device that uses ninety different programs for testing. It uses four channels to use for connecting up to eight electrodes. It also has a current generator that can create constant currents even in changes. It will stop when the electrodes are disconnected. The biphasic square wave setup will keep polarization effects from being a hassle. The keyboard is easy to use and the on-line guide makes it easy to figure out what can be used. Different male and female treatments are available as well. This uses a Ni-Mh rechargeable battery pack at 1600 mAh and works with five languages and is compliant with 9342/EEC MDD standards. It also comes with a battery charger, a full manual and a box and carrying bag that both fit the device.