Hot Spot TX:     2006-2012  Hot Spot TX RX  or SX   is indicated by the letter in the serial number. for example. Serial Number  TX RX SX-3H2015 the serial number would read TX RX SX is model  3 third quarter L year(2006) and 2015 is the unit number made. Serial Number  TX RX SX-3J2015 the serial number would read TX RX SX is model  3 third quarter M year(2007) and 2015 is the unit number made. Serial Number  TX RX SX-3K2015 the serial number would read TX RX SX is model  ..
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