ALEKO TS-TC12 Multi-Dog Training System for One Dog Range up to 1000 m (on open air), patented design Multi-dog training system-expandable to three-dog operation, can train up to three dogs from the same 3 modes for correction and training - tone, vibration and stimulation, 99 levels for each model Free combination among tone, vibration and stimulation Low power consumption for long life battery, advanced high-tech microchip and RF modules