The Prestan adult offers feedback in the form of a clicker for compression depth and LED lights which show quality CPR across depth and speed. Different coloured lights are used on the shoulder of the manikin to show respective quality of CPR and whether the rate needs to alter to reach optimal CPR Mentone Educational is pleased to offer the Prestan CPR manikin as a single unit, in a pack of four, part of the Prestan family pack and in Mentone's starter packs Each Prestan Adult single manikin includes a 10 pack of face shields and lung bags to allow for easy setup. AA batteries are required to run the LED lights (not included).