This AED training unit includes a replaceable scenario/language module - making it the most unique and cost effective unit on the market today. Our replaceable module means that when ECC guidelines are updated, you only need to upgrade your plug-in module - no need to buy an entirely new unit or send it out for re-programming. The WL220ES05 includes: Lightweight and easy to carry unit Fully compliant with new ECC 2010 CPR Guidelines. Easy to install/replace module that has our pre-programmed scenarios in 2 languages (currently English/Spanish). Remote control unit provides instructors with easy access to changing scenarios and ability to pause play for classroom discussion. Requires 2 AAA batteries, not included. 8 pre-programmed scenarios provide useful training and troubleshooting options for students. Adult and Child pads and training connectors are included for complete training. Uses 3 AAA batteries (not included) or A/C Adapter which is sold separately. 1 year warranty.