The LEGO EV3 Brick comes with the ARM-9 processor which is significantly more powerful than the previous NXT. The operating system it is running on is a lean Linux OS, which therefore is more hackable friendly. The default firmware can be program with the visual-based EV3 software which can be freely downloaded on the LEGO website. This EV3 Brick uses 6 AA Batteries or the EV3 Rechargeable Battery, and both are sold separately.