PetSafe Deluxe Big Dog Trainer, PDBDT-305 This is the older version of the PDT00-13411 10 easily adjustable levels of stimulation, from 250 volts to 7000 volts Option for negative tone without correction and negative tone with correction Low-battery indicator light; expanded training manual and batteries included Transmitter measures 1 by 1-1/2 by 6 inches; receiver 1-1/4 by 2-1/2 by 1 inches; limited lifetime warranty