HKYRD Generic Replacement Waterproof DC/DC Converter 12V Step down to 3.7V Power Supply Module (White) Usually, It takes 10-18 days to arrive, If they are damaged during the transportationyou can contact us for exchange. But, we will not accept returns if this item is damaged during the installation process. Net weight: 30 g, package weight: 15 g. All epoxy sealed containers with Waterproof Housing; Light compact, convenient to use and transport;Non-isolated; High efficiency:&gt;96%; Reliable, low heat dissipation max. 40 ; With overload / over-current / over / low voltage protection, stable performance.