... for over charge , over discharge, short-circuit to keep the charging process safely.4.Batteryindicator button, whatever it's on ... ADSL/DHCP and WAN/LAN without any preset profile.2.The patented software, it could make wired broadband connection automatically , ... and Play, no need install any software, compatible with all the operating system such Mac, IOS, windows ,Linus, Android.Wi-Fi Hotspot ...