Lightning and surge protection Rain, dust and insect protection Frost and dew protection High grade aspherical lens Twin synchronized pulsed beam design for greater stability 99.5% beam blocking stability A.G.C. circuit Adjustable beam interruption time 3 step LED indicator (ALPHA versions) AX-100PLUS 60m Indoor 30m Outdoor AX-200PLUS 120m Indoor 60m Outdoor AX-260 PLUS 160m Indoor 80m Outdoor AX-330 PLUS 200m Indoor 100m Outdoor