Peb cov ncej telescoping yog siv rau qhov siab qhov chaw xws li qab nthab, pem teb, thiab nkag mus rau qhov chaw.Tus pas nrig tuaj yeem txuas mus rau 40' lossis ntev dua, 3' lossis luv dua rau kev khaws cia thiab tuav tau yooj yim.