Ba zai yiyu ba a tattauna madubin jan tirela ba tare da kawo batun madubin telescoping ba.Mudubi na telescoping, wanda kuma aka sani da telescopic ko madubai masu tsayi, nau'in madubi ne na ja wanda zai iya fitowa daga ɓangarorin abin hawa don ƙara hangen nesa na baya.An fi samun wannan fasalin akan aikace-aikacen madubi na ja, saboda ba a buƙatar shi akan ƙaramin madaidaicin madubin kallon gefen.

Madubai na telescoping na iya samun duk zaɓuɓɓuka iri ɗaya kamar madubin da ba na telescopic ba, kamar wutar lantarki, jagora, hasken kududdufi, siginar juyawa, nadawa, da sauransu, amma sun fi girma kuma suna ba da damar ƙarin hangen nesa.Madubin telescopic na hannu yana buƙatar a shimfiɗa shi tare da ƙarfin ɗan adam na zahiri.Masu ƙarfi, a gefe guda, suna ba ku damar zama a cikin jin daɗin motar ku yayin da kuke danna maɓallin don sa madubin ya shimfiɗa waje.

Mudubin telescopic na iya zama babban haɓakawa idan motar ta riga tana da madubin ja amma tana buƙatar ƙarin hangen nesa don duk abin da yake ja.Har ila yau, kari na madubin ja yana ƙara kamannin babbar mota ta hanyar sa ta fi girma.