ACK's E-01 ELT has been discontinued and has been replaced by the ACK E-04 406/121.5 MHz ELT. The E-04 has been designed as the same shape and size as the E-01 so aircraft owners replacing the units can use the same mounting tray and straps without having to modify anything. However the internals are completely different so internal modifications between the E-01 and E-04 are not possible.
The 406 MHz beacon's transmitted power is 50x greater than the old 121.5/243 beacons. Location accuracy without GPS is greatly improved over the 121.5/243 ELTs. With GPS, location accuracy can be within several hundred feet. The ACK 406 ELT has been approved in Eurpean countries and has Transport Canada TSP approval.
The ACK E-04 ELT Kit includes: transmitter, lithium battery pack, external antennak, remote control, mounting tray and retaining straps, plug-in audible alert, remote cable, coax cable and installation manual.