Wide voltage input 100-240V AC, suit for all country.Adjustable stretch length 100-400mm.Window small as 470mm is suitable., for more than 10000 times open & close.high-quality material-made double layer chain, operate smoothly.Two flame resistance ABS holders and the POM sliding guide make the motor more silent and .Easy to install and take down.Working voltage: 100-240V ACSpecification size: 460mm x 42mm x 55mmPush/Pull Force: 250NPower:28WColor: As ShownMaterial: Metal+PlasticPackage Contents:1 * Window Opener1 * Switch ControllerOnly the above package content, other products are not included.Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.