Electric Pet Heat Pad: Waterproof Heating Mat for Cat Dog Bed | Chew Resistant XLProduct Principle: Place the heating pad on the couch, then turn it on and let the pet lie on it. After about 20 minutes, you can feel the heating pad warming up. Attention: For pet use ONLY. NOT for human use Do not use the cord as a handle Do not puncture or use any sharp object to secure the pad in place Unplug when not in use DO NOT make any modifications to switch button, wires and heat element DO NOT use another electronic heating device in