Heavy Duty Radio,Excavator Radio With AUX And USB Input 12V 24V Heavy Duty AM/FM Radio for Tractor Truck Grader USB Sockets,Certified thunder-proof, aseismic and waterproof, also have a much higher resistance to vibration than most of other radios All world frequency in unit; Aux-in Anti-seismic grade: Grade 13 (Japan JISD 1601 grades,67z ,70m/s2,6.8G ) Standby current is 2mA,Long time no use will be no battery consumption It is suitable for excavator,kart,loader,grader,earth moving machine,skidder ,Mining Machinery,Metallurgical Machinery ,Lifting Machinery ,Cultivator, Harvester, Tractor