!! Attention the article is no longer available !! The Hik Thunder 19C is a clip-on attachment with OLED screen, equipped with WiFi, 19mm focusable lens, 16GB video recorder for videos and photos and can be operated with rechargeable batteries or batteries. The following is required for installation on an optic; Rusan adapter ARM52 universal and Precise hunt Hikmicro adapter. We recommend this for cost-effective operation Nitecore Battery Bundle. Danger! The batteries must not be recharged in the device, otherwise it would break.