The ICOtec GC500 Predator Caller is pre-loaded with 24 calls including coyote yips and howls, ample distress calls, other predator calls. The ergonomic remote is backlit so it is easy to view during night hunts. It can also activate an electronic decoy (sold separately). It has an external speaker jack for added volume when hunting in extreme conditions. This caller runs on four AA batteries and the remote requires one 9-volt battery (each sold separately). It stores up to 200 calls without an SD card. This caller accepts up to a 32 GB SD card (sold separately). Calls can be downloaded directly onto the unit or onto an SD card.