How bright is the Ultra Lumens Pro?

It uses a 20-watt CREE LED, the brightest headlamp in its line, with a beam that reaches hundreds of meters. Expect car-headlight-level output on high.

What is the zoom function for?

The zoomable lens focuses the beam into a tight spot for long-distance viewing or spreads it into a floodlight for close work and wide area lighting.

What batteries does it use?

It runs on 18650 Li-ion cells, and three rechargeable batteries come in the box. You can recharge them through the included USB cable.

It is water resistant, not rated for submersion. Rain and splashes are fine; do not dive or soak it.

What comes in the box?

The CREE LED headlamp, a USB charging cable and three 18650 batteries.

Is it good for running?

It is heavy and very bright, so it suits hiking, hunting and night work better than fast running. Runners usually prefer a lighter lamp with lower output.