Dr.Ho's Magic Heat Pad 2 pack Venture heating pads Square Pulse Pulse Amplitude 0 canes Square Pulse Pulse Amplitude 0 100 mA peak to peak (into 500 ohm load) Pulse Rate Width 2 150 Hz 50 300 µS Contraction Relaxation 2 90 seconds (Adjustable) Power Source 9 Volt Battery Warranty 1 Year Manufacturer Warranty Blister packs result in minimal waste disposal The heat pad contains non toxic ingredients and is comprised of only a salt based solution and water Unlike other heat pads which you either have to throw away or use a microwave the DR HO'S Magic Heat Pad is reusable and can be reused thousands of times providing you Pain relief all day long