Multi-Dog Training System 1. Multi-dog training system-Expandable to three-dog operation. 2. Train up to three dogs from the same transmitter (purchase extra receivers separately). 3. Range up to 1000M (on open air). 4. 3 modes for correction and training-Tone, Vibration and stimulation. 5. 100 levels for each model. 6. Free combination among Tone, vibration and stimulation. 7. 3 group memories for each dog. 8. Big LCD digital display for instruction. 9. 9V alkaline battery replaceable for transmitter(included). 10. 2xAAA alkaline battery for the receiver. 11. Frequency: 433.92MHz. 12. Low power consumption for long life battery. 13. Advanced high-tech Microchip and RF modules.