SportDog FieldTrainer 425 - Ideal for training in the yard or field or for hunting with close-working dogs， the SD-425 model allows you to switch instantly between 7 levels of low/medium stimulation， as well as vibration and tone options.

• 7 instantly selectable static stimulation levels with low/medium stim ranges
• Option to train with vibration or tone
• Up to 500 yard range
• Expandable up to 3 dogs without loss of vibration/tone features
• DryTek waterproof and submersible to 25 feet
• For dogs 8 pounds or larger with neck sizes 5" to 22"
• Rechargeable lithium-ion batteries