The Traditional shaped thermal scope from Conotech comes in Four(4) variations with both 50 or 35mm lenses and 384 or 640 pixel sensors. Night Arrow uses 12um thermal imaging sensor with less than <25mk NETD, which offers sharp, richly contrasted images while retaining the accuracy of the day scope. In addition, Night Arrow supports an external removable battery to increase your hunting duration to more than 12 hours! Also, Night Arrow supports quick charge in 3 hours.