All-terrain system.IP-66 rated (waterproof/dustproof).100 Watt RMS full-range class D amplifier.(6) 3.5in. Midrange speakers (4) .5in. horn-loaded tweeters.Aluminum enclosure w/internal H.D.S. (heat dissipation system).Connectivity w/audio output of ipad, iphone, smartphones & MP3 players.Multi-fit clamp system and surface mount.Line in (RCA or 3.5mm) and digital input.Compatible with NA1BT sold separately.Low standby current spacing auto shut-off.Water & shock resistant.Coaxial digital output.