They are enough for you to do most job. 2-Speed Gearbox: The cordless drill driver maximum speed is 1400 RPM, good for you to drill holes. And the low setting reaches 400RPM, better to use the drill as a screwdriver to protect the screw (0-400 rpm/1400 rpm).
This product would be ideal for professionals who require a versatile and portable drilling machine for various construction and remodeling projects, where charging is not always an option.