The iTowBot  is now available with a built-in 24-Volt  Auxiliary Power Plug and Power Cord for  starting aircraft or running accessories on  the ramp or in the hangar. The built-in  APU option is priced at only $1,000  in addition to the cost of your iTowBot. The iTowBot is now available with a built-in 24-Volt Auxiliary Power Plug and Power Cord for starting aircraft or running accessories on the ramp or in the hangar. The built-in APU option is priced at only $1,000 in addition to the cost of your iTowBot.