The 1st Choice tens unit is the most simple of our two high quality, value-for-money tens units. This compact easy-to-use tens can treat two pain areas at once. It has Pulse Rate and Intensity Adjustment as well as Burst, Continuous and Modulation (Massaging) modes, allowing you to adjust the pulse sensation to avoid your body becoming used to one setting. A 'must' for those with a smaller budget. Want more info? See 1st Choice TENS Manual.