Available is one HP5501A laser head for your GCA units. Power output is 310 Uwatts...90 days warranty as the manufacturer. Let me know Mario A. Portillo Sr. High'born Technology USA Inc. Semiconductor Equipment Services 8130 Glades Road, #229 Boca Raton, FL 33434 561 479-1975 office 561 504-0244 cell hbtusainc at yahoo.com www.hbtusainc.com