device - an instrumentality invented for a particular purpose; "the device is small enough to wear on your wrist"; "a device intended to conserve water"

gadgetry - appliances collectively; "labor-saving gadgetry"

gimbals - an appliance that allows an object (such as a ship's compass) to remain horizontal even as its support tips

injector - a contrivance for injecting (e.g., water into the boiler of a steam engine or particles into an accelerator etc.)

mod con - modern convenience; the appliances and conveniences characteristic of a modern house