Brightness: Approximately 30 lumens. Continuous usage time is approximately 300 hours (when using alkaline batteries). Requires 4 AA batteries (sold separately). [Caution] Please read the precautions printed in the instruction manual carefully before use. Please do not use Oxidide batteries (a registered trademark of Panasonic). The initial voltage is high, which may cause the main unit to malfunction. This product is not completely waterproof.