Kerr AC-04 Adapter By using an AC adapter you will use less batteries over the life of your products. Use with Smart Caregiver Cordless Alarm 433-EC (latest version sold beginning in 2016), in place of 3 C batteries, as well as with Smart Caregiver Motion Sensor 433-MS and Motion Sensor with Pager TL-5102MP, in place of 3 AA batteries. Compatible systems listed in the product description below.