Automatical limit positions correction function even motor brake failed higher safety, all built-in electronic parts sealed by complete box
Electronic limit switch setting, six different limits setting
Built-in 7.4V 22000mA rechargeable battery powered, last half a year once fully charge, if operated 2 times (double round trip) a day. Maxim 504 times recharge
Low voltage safety DC motor continuous running. No heating protection limitaion