Is the iQ Plus strong enough for a large dog?

It is designed for dogs 10 pounds and up but delivers low to medium power. It fits small and medium dogs best; strong, high-drive dogs usually need a higher-power model.

Can I train two dogs with one remote?

Yes. The system is expandable to two dogs with one remote, but you need a second receiver collar, which is not included in the box.

What is the difference between nick, constant, and vibration?

Nick gives a brief static tap, constant delivers static while you hold the button, and vibration-only gives a non-static cue. All three are set from the same 1-100 level dial.

Can the collar be worn in water?

The receiver collar is fully waterproof, so a dog can swim or get rained on while wearing it. The handheld transmitter is only water resistant, so keep it out of water.

How long does the battery take to charge?

The battery is a two-hour quick-charge type. A universal charger and splitter cable are included so the transmitter and receiver can charge together.

What comes in the box?

The box includes the transmitter, receiver, a 28-inch collar strap, 5/8-inch contact points, the quick-charge battery, a universal charger, a splitter cable, and the owner's manual.