!! Attention the article is no longer available !! The standalone thermal imaging device Challenger-35 is equipped with a strong VOx sensor. The range is 1235 meters. It is possible to record, either on the internal 8 GB memory or via USB on an external hard drive or USB stick. The internal battery lasts for about 5 hours. It weighs just 510 grams and is compact and ergonomically built. Wireless transmissions via Wi-Fi are also possible. The thermal imaging device is ideal for stalking.