π Pi（42-50）series binoculars，ED lens for chromatic aberration compensation and brighter, clearer viewing. Light Transmission ≥ 93%. HD (High Definition) optical system makes images cleaner and sharper. IPX7 WaterProof and Argon Filled.

IPX is an international waterproof certification system. All WP of Asika products are IPX7 level(1m / 30mins).