24" fully extended. Retractable cone collapses to only 2" high for easy carry and storage. Foot print is 12" x 12". Night visibility is 850 ft. Durable base is made of heavy duty polypropylene. Light assembly stores conveniently in the reservoir base. The thick polyester cone is resistant to most chemicals.Usable temperature range is -40 degrees F to +130 degrees F. Hazard light flashes 130 time per minute and operates on two included AAA batteries.