The NEC NP13ZL 1.5-3.0:1 Zoom Lens is a manual 2x zoom lens. It is compatible with the NEC NP-PA600X, NP-PA500X, NP-PA550W, NP-PA500U, NP-PA500X-13ZL, NP-PA500U-13ZL, NP-PA550W-13ZL and the NP-PA600X-13ZL projectors. The lens is easily installed by end users and doesn't require any special tools.