Most freight cars carry automatic equipment identification RFID transponders. All transponders and beacons are operational. Most have computer readable automatic equipment identification transponders. Each satellite has 32 Ku-band transponders. The satellite was equipped with 3 TV transponders (including reserve units). Sky also make the channel available on one of their own satellite transponders. SmCo (cobalt); used for permanent magnets in guitar pickups, headphones, satellite transponders, etc. VivoKey Technologies developed the first cryptographically-secure human implantable NFC transponders in 2018. IFF (identification friend or foe) air defence transponders identifiable by three closely spaced short aerials. The second major module is the communication payload, which is made up of transponders. The existing transponders installed in aircraft were unaffected. Lower charges are levied on frequent 407 users who carry electronic transponders in their vehicles. HD channels are being beamed from the four transponders on GSAT-15. Nimiq 6 has a payload of 32 high-powered Ku-band transponders. Communications are handled by two 230-watt TWTAs and two coherent transponders.