This wireless/cordless system has both the bed pad and chair pad. When the patient lifts their weight from either pad, the alarm will sound up to 100' from the pad. Pads are made of a high quality soft vinyl, incontinence protected and feature a layer of foam for more comfort for the patient. The alarm monitor is about the size of a large coffee cup and can be easily carried about the home. The alarm features 3 volume levels and an on/off switch. The bed pad should be placed under the lower sheet in the bed, or in the chair. When the patient lifts their weight from the pad, the alarm will sound. The caregiver can take the alarm anywhere up to 100' from the pads and still receive the alarm. This system will also wake the care person at night so they can rest easy, knowing they will know the moment their patient starts to rise from their bed. This system operates on 3 C batteries, (not included) however, to reduce the amount of batteries you will use for the life of your products, you might wish to purchase an AC adapter for this alarm unit. Contact seller for details.