Active RFID at Dock or Gate ...

Active RFID and Infrared Electronic Seal: Freight Transportation Vulnerability, Security, and Productivity ...

Encrypta Electronics, Waterside Ct., Albany St., Newport, NP20 5NT, UK

... "Frequency either 433.92 MHz or 914.5 MHz. Transmit range is 120 yards at 433 MHz and 60 yards at 914 MHz. Wake-up frequency is 134.2 kHz, usually in ground loop antenna at gate or dock. " ...