ACK E-01 ELT by ACK, Inc. From now until the end of June, take $20 off your dealer price on the ACK E-01. Features of the E-01 include: -Uses standard Duracell® batteries -Smallest, lightest TSO-C91a ELT available -Easy to install · Requires no aircraft power -Fire resistant, high impact plastic case -Waterproof to 60 ft. -Easily removed from aircraft for service -Coherent beacon designed for satellite detection -Two Year Warranty Dealer's Only