... Dual RS232 and USB ports Dust-proof with metal-frame 22inch dust-proof touch panel spec.Company Name: Shenzhen KeeTouch Electronic ... ,transducer bevel mounted,water-proof type. Technology: Surface Acoustic WaveSize: 22inch, 16:9 (from 7"-47"are available)Feature: Anti-dust ... glue tapedust-proof tapeAgency Approval: UL, CE, FCC, RoHS, CB 22inch dust-proof touch panel sealed with frame