... yearsAdopt low technology handling methods ,just can be waterproof and antirust for one yearOperation methodsReading card, remote control, manual ... sensitive reaction, low noiseB. Surface is shaped by 13 process flow, and use import paint. Excellent rust-proof, waterproof ablity. C ... barrier boom can be instant turn on and off, accurate location.D. Control system adopts hi-tech digital chip technology.E ...