These come in many different sizes or styles depending on the environment you are in. The one you use might be under the counter and pops out/open at the completion of a sale, or your store might have one with a flip-top lid like in some supermarkets. Some are fitted with a timer for added security. At the start or end of a shift, you may be required to carry a cash drawer from the office to your till or visa versa. Your cash drawer should be regularly cleared to minimise the amount of cash kept on the shop floor in case of theft.