Qhov tseem ceeb tshaj plaws ntawm cov khoom ua si cia pob tawb no yog nws lub peev xwm loj. Qhov dav sab hauv tuaj yeem tuav tau ntau cov khoom ua si, txawm tias nws yog cov khoom ua si plush, lub tsev thaiv, lossis cov khoom ua si tsheb. Ua los ntawm siab -cov ntaub ntawv zoo, ib puag ncig tus phooj ywg, lub pob tawb yog qhov ruaj khov, ruaj khov, thiab muaj zog thauj khoom- cov kabmob muaj peev xwm, tiv thaiv kev deformation txawm tias puv puv nrog cov khoom ua si. Tsis tas li ntawd, cov npoo tuab txhim khu kev nyab xeeb thiab txo qhov kev pheej hmoo ntawm kev raug mob rau cov menyuam yaus thaum siv.
Dhau li ntawm nws lub peev xwm loj, portability yog lwm qhov tseem ceeb. Tus kov tsim ua kom yooj yim txav, txawm tias los ntawm chav nyob mus rau chav pw lossis coj mus rau sab nraum zoov ua si. Kev tuav ntawm ob sab cia cov menyuam nqa nws tus kheej, txhawb nqa lawv txoj kev ywj pheej. Qhov tsis yog- plam hauv qab ua kom nws ruaj khov ntawm qhov chaw du thiab tsis yooj yim plam.
