Visible up to 1 mile away at night, the collar is lightweight with soft webbing inside the collar. It has a metal D-Ring to attach the lead and an on/off switch for the flashing. Fluorescent and reflective, shock proof and water resistant. 100's of hours from the battery (included). The collar is fully adjustable for extra comfort. Excellent when walking on the roads, even better when trying to find the dog in pitch-black fields.