Comparing the NURSAL 4 in 1 TENS Unit and the AVCOO 3-in-1 TENS Unit
NURSAL 4 in 1 Tens Unit Muscle Stimulator, Dual Channel EMS Massage Machine with 40 Intensities, 25 Modes Rechargeable Electronic Pulse Massager for Back Pain Relief Therapy with Electrode Pads & Case 3-in-1 TENS Unit with 32 Modes, Dual Channel EMS Muscle Stimulator with 40 Intensities for Gradual Pain Relief Therapy, Rechargeable Electronic Pulse Massager