The Mettler Electronics TENS 212  is an affordable two-channel TENS unit that has continuous, modulated and burst modes. Additionally, the digital display shows all treatment parameters while the unit is in use. Pulse frequency and width may be set independently. Furthermore, the compliance meter provides patient-use information in hours. The timer may be set for 15, 30, 60 minutes or continuous stimulation. Each unit comes with a carrying case and all supplies necessary for therapy.