Siretta mica series 3g amp 4g dual lan compact industrial routers siretta mica w21 lteeu acc the siretta mica w21 lteeu router is a high speed cellular router employing european 4g and wi fi technologymica routers are designed for use in industrial environments needing high performance and a robust enclosure as standard they are ideal for remote management telemetry condition monitoring cctv atms vending machine and other m2m applications siretta mica w21 lteeu 4g router with