"提示台词的设备" can be translated as "device for prompting lines" or "line-prompting equipment".
"Device for prompting lines" clearly describes the function of the equipment, which is to prompt or display lines (dialogue) for the user.
"Line-prompting equipment" is a more concise and technical term that also accurately conveys the purpose of the device.
Both expressions are acceptable and can be used depending on the context and the level of formality required.