Mainboard: ELF mini V2.1 Operating Voltage: 3-6V (3.7V Lithium battery included, 4 blue LED power indicator) On-board Sensor: Light Sensor, Sound Sensor, IR, RGB LED, Buzzer. External Sensor: RGB Ultrasonic Sensor, Double-way Line-following Sensor, 5*14 LED Matrix Panel Communication: Bluetooth, IR Switch: 1 xTouch switch (turn on/off robot when toggle switch is off) 1 xToggle switch (keep robot turned on when toggle switch is on) APP: WEEEMAKE (IOS & Android) Program Software: WeeeCode (Scratch 2.0 &3.0), Arduino IDE.

Mainboard: ELF mini V1 Operating Voltage: 6-10V (6 AA battery, not included) On-board Sensor: Light Sensor, Sound Sensor, IR, RGB LED, Buzzer. External Sensor: RGB IR Avoid Sensor, Single-way Line-following Sensor, 5*14 LED Matrix Panel Communication: Bluetooth, IR APP: WEEEMAKE (IOS & Android) Program Software: WeeeCode (Scratch 2.0 &3.0),