Not sure what this is exactly, but looks just like an Opti. At Amazon, free shipping.http://www.amazon.com/SteriPEN-Protector-Handheld-Water-Purifier/dp/B002WN432E/ref=sr_1_44?s=sporting-goods&ie=UTF8&qid=1316151561&sr=1-44
Military version of the Adventurer. You can see the side contacts in the photo. Still a good deal.
Personally I wouldn't get a Steripen without the round stopper that fits into 1/2 liter water bottles. Those style are so convenient.
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