A bicycle trailer is a motorless wheeled frame with a hitch system for transporting cargo by bicycle. It can greatly increase a bike's cargo capacity, allowing point-to-point haulage of objects up to 4 cubic yards (3 cubic meters) in volume that weigh as much as half-a-ton.
manual
manual of arms: (military) a prescribed drill in handling a rifle
(of a machine or device) Worked by hand, not automatically or electronically
of or relating to the hands; 'manual dexterity'
bell
The sound of a bell
a hollow device made of metal that makes a ringing sound when struck
A hollow object, typically made of metal and having the shape of a deep inverted cup widening at the lip, that sounds a clear musical note when struck, typically by means of a clapper inside
doorbell: a push button at an outer door that gives a ringing or buzzing signal when pushed
A device that includes or sounds like a bell, used to give a signal or warning