The product has survived a deployment and then kaput! From the first there was Eischalten Scwierigkeiten - only after repeated low pressures with a fingernail was light - it will vary the brightness as described in the description was not possible. The second Eisatz (an evening Nordic Walking Tour) began the lamp after approximately 30 min. To flicker. After starting and switch after a short time the same game. Have already written to amazon and asked a dealer in our region to designate, as I do not trust to Abkassierung the very high price of the correct processing after returning - bad experience of acquaintance with Internet rip-off - The mail was indeed confirmed, but no indication of help or advice. KP