E-collar training can be intimidating. iQ FLEX has upgraded features, informed by professional dog trainers' feedback, to make beginning e-collar training simpler for newcomers. Tailored to You: Customize the unmistakable function keys to your specific preference for recall or training commands Beginner-Friendly: A large font status display screen and enlarged buttons make this compact, lightweight trainer user-friendly. Doggo-Friendly: IPX9K extreme waterproofing, a safety level lock, nickel-free plastic contact points, and a convertible receiver that fits dogs of all neck shapes and sizes. Precise Level Control: The output correction amount can be adjusted to 99 micro-levels using the level buttons, ensuring the exact amount for your dog. Key Features: Li-Po Batteries (2-3Hour Rapid Charge) For dogs as small as 5 kg IPX9K Fully Waterproof Receiver Expandable Transmitter up to 3 Receivers Not compatible with the handsfree square Non-Stimulating Pager Vibration Up to 400 meters 99 STIMULATION LEVELS WITH SAFETY LEVEL LOCK Low to Medium Power Stimulation Nick and Constant Stimulation