Horizontal Design Provides An Improved Ergonomic Fit On Belt New And Improved Lead Wire Connector Will Not Disengage From Tens Unit Easy And Convienent Flip Down Control Panel And Battery Cover Reduces Cover Loss Or Damage Dual Isolated Channels Adjustable 0-80 Ma 500 Ohm Load Pulse Frequency Adjustable 2-150 Hz Pulse Width Is Adjustable From 60-250 Micro-secon Wave Form: Asymmetrical Bi-phase Square Pulse Modulation Selector Offers Wave Delivery In Norma Bust Or Modulation Modes Plastic Belt Clip Comes Complete With Carrying Case 2 Lead Wires With Deluxe Connector 9-volt Battery 1 Package Of 4 Pre-gelled Electrodes And Operating Manual 3 Year Limited Warranty