Components that earn their place.

A DC jack male is a power connector used to supply DC electrical power from an adapter, battery, or power source to an electronic circuit or device.

A female-to-female jumper wire is an electrical connecting wire with female connectors on both ends, used to connect components that have male header pins.

A male-to-female jumper wire is an electrical connecting wire with a male pin on one end and a female connector on the other end.

A male-to-male jumper wire is a short electrical wire with male connector pins on both ends, used to connect electronic components, sensors, modules, and Arduino boards.

A double AA battery holder is a plastic holder designed to securely hold two AA-size batteries and connect them to an electronic circuit.

An AA battery holder (single-cell) is a small plastic holder designed to securely hold one AA-size battery.

A 3-cell rechargeable battery holder is a plastic holder designed to securely hold three rechargeable batteries, commonly 3.7V Li-ion cells.

A 1-cell rechargeable battery holder is a plastic holder designed to securely hold one rechargeable battery, commonly a 3.7V Li-ion battery.

A 2-cell rechargeable battery holder is a plastic holder designed to securely hold two rechargeable batteries and provide electrical connections to a circuit.

A standard electronic power supply that converts household AC voltage (100–240V) into a stable 12-volt DC output at up to 2 amperes (24 watts). It typically features a 5.5mm x 2.1mm or 5.5mm x 2.5mm center-positive barrel connector.