Tens Mod AS2018 Electro Estimulador 10 Programas 8 Pads4 channel10 modes 4.5V/3AAAGrade of Strenght: 20frequency:1~120HZpulse width:100~250uSOutput voltage:0~40(V)Size:200*60*19.8mm(mm)Weight: 120(g)housing material: ABS4 Line8 Pads1 Pds Holder1 pc USB