PetSafe Deluxe Little-Dog Remote Trainer for Pets Under 40 Pounds, PDLDT-305 Older model of the new and improved PDT00-13410 10 easily adjustable levels of stimulation, from 400 volts to 6000 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 3/4 by 2 by 1 inches; limited lifetime warranty