The Ameri-King AK-450 is an FAA-TSO’d approved #TSOC91A, ELT type Automatic Fixed, Automatic Portable. This ELT may be manually selected or automatically activated upon a crash and transmit the standard swept tone of 121.5/243.0 MHz simultaneously. In addition, it may be used for transmitting voice communication to Search and Rescue Team on the emergency frequency 121..5/243.0 MHz channel. Uses 6 “D” size Duracell alkaline batteries. No aircraft electrical power is required. Size: 4.27″W, 2.95″H, 5.64″L, weighs 2 lbs. 10 oz. 2 year warrant, 2 year extended available for $35.00.