I have some question about the turtlebot3 hardware

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Hello,

Since i'm working on a internship project using autonomous mobile robots, i'm interested in using the turtlebot3 burger, before buying it i have a few questions about the robot :

-First of all, what raspberry pi card model is being used in the turtlebot3 burger robot ? -Since the robot is wirelessly controlled, what wireless connection is used to communicate with the remote pc ? if it's wifi does it require an additional usb wifi module ? -Final question is about the map processing and visualization (SLAM), is it done on the raspberry card or remotely on the computer? since the mapping and localization might affect the power consumption of the robot. Thank you in advance for your reply.