Bipolar stepper motor. It has a resolution of 200 steps/revolution (1.8° per step), a rated voltage of 4.5 V, and draws a current of 0.67 A per coil. Pololu 1206

Bipolar stepper motor. It has a resolution of 200 steps/revolution (1.8 ° per step), a rated voltage of 2.7V, and draws a current of 1A per coil. Pololu 1209

Bipolar stepper motor. It has a resolution of 200 steps/revolution (1.8° per step), has a nominal voltage of 4 V and draws a current of 1.2 A per coil. Pololu 1200

Adapter that allows you to easily mount the wheels on a motor with a shaft diameter of 4 mm using screws size 4-40. The hub fits both round and D-shaped shafts. Pololu 1081

Compact and complete robot controller, containing the ATmega328P AVR microcontroller (with 32 KB of Flash memory and 2 KB of RAM memory) and a two-channel DC motor driver. Pololu 1220

Rechargeable NiMH AAA Battery: 1.2 V, 900 mAh, 1 cell

The Step-Up Buck Voltage Regulator module with adjustable output voltage in range of 2.5-9.5V with a input voltage range of 1.5-16V and a maximum output current of 2A. Pololu 791

The holder for 2 AA R6 double-row batteries is an ideal solution for people who need a simple and reliable way to connect AA batteries to obtain a voltage of 3 V

The holder for 4 AA R6 double-row batteries is an ideal solution for people who need a simple and reliable way to connect AA batteries to obtain a voltage of 6 V

Holder for 3 AA R3 batteries with a flap and a switch is an ideal solution for people who need a simple and reliable way to connect AAA batteries to obtain a voltage of 4.5 V

Holder for 3 AA R6 batteries with a flap and a switch is an ideal solution for people who need a simple and reliable way to connect AA batteries to obtain a voltage of 4,5 V

Holder for 2 AA R6 batteries with a flap and a switch is an ideal solution for people who need a simple and reliable way to connect AA batteries to obtain a voltage of 3 V