The charger is used for storing and charging max 25 pickup units. To load audio content to pickup units, set up a master pickup, download the content and then clone 25 units in one go. With a size of 165 x 165 x 52 mm ( 6.5 x 6.5 x 2.0 in) the pickup charger means you can store the pickup units in a very limited space.The pickup charger is the perfect solution for storing, charging and updating content on up to 25 PICKUP audio guides.