Cisa high quality electric lock. Pull resistant up to 2000kg, tested for one million cycles. For use on inward opening wooden doors. With or without mechical button. Features the Cisa patented dead locking latch. Zinc-plated steel case and striker. 12 V ac CE. Suitable for heavy as well as light weight doors. Supplied with three keys, fixing screws and fitting instructions.Can be opened using remote transmitter for keyless & wireless door opening.(see links below)