What is a characteristic of a slip-tip syringe?

A slip-tip syringe is specifically designed for ease of use when attaching a needle. It features a tapered tip that allows a needle to slide on snugly and securely without the need for any additional mechanisms. This straightforward approach facilitates efficient preparation of medications, especially in a fast-paced environment where time is crucial.

Characteristics such as having a locking collar (which is typical of a luer-lock syringe), requiring a special adapter for attachment (which is not necessary with slip-tip syringes), or having an open tip for easy emptying (which isn't a standard defining feature of slip-tip syringes) do not apply in this context. The emphasis on the simple and intuitive way to attach a needle to the slip-tip syringe is what makes it the correct choice.