1) The document describes a wireless robot controlled by RF module that can detect obstacles, flames, and chemicals. Sensors allow the robot to perform these detection functions.
2) The robot uses an Arduino board and can be navigated around areas wirelessly using a remote control with an RF transmitter and receiver module.
3) The robot is capable of detecting obstacles using ultrasonic sensors, flames using a flame sensor, and chemicals like hydrogen using specific gas sensors. LED lights indicate when detections are made.