Under mattress Epilepsy sensor plus home remote monitoring. All items are previously used but fully tested & working and in great condition. Monitor your child or family member remotely in the home for epileptic seizures, giving peace of mind you will be alerted no matter where you are in the home, or away from home as entirely portable. The epilepsy unit is mains plus AA batteries , the portable home monitor is a rechargeable li-on battery which I do not guarantee lifespan of but do include a new spare. Comes boxed with full instructions. These epilepsy sensors alone cost around £600 new without the other accessories, so grab peace of mind at a bargain price.