An image capturing device comprising: an imaging unit comprising: a housing that comprises an inner surface, wherein the inner surface of the housing defines a lens channel, wherein the inner surface of the lens channel defines: a contact point (414a, 414b) that protrudes outwardly from the inner surface into the lens channel, and a through hole, in the lens channel, which extends from the inner surface of the lens channel to an outer surface of the housing; and a lens barrel received in the lens channel, the lens barrel comprising an outer surface that defines: a first portion, a first platform that circumferentially rotates about a first central longitudinal axis of the lens barrel, wherein a radius of the first platform is greater than a radius of the first portion so that a first step is defined at a junction between the first platform and the first portion, a groove defined on the first platform, wherein the groove circumferentially rotates about the first central longitudinal axis of the lens barrel, wherein when the first step abuts the contact point (414a, 414b), the groove is exposed via the through hole. an imaging unit comprising: a housing that comprises an inner surface, wherein the inner surface of the housing defines a lens channel, wherein the inner surface of the lens channel defines: a contact point (414a, 414b) that protrudes outwardly from the inner surface into the lens channel, and a through hole, in the lens channel, which extends from the inner surface of the lens channel to an outer surface of the housing; and a housing that comprises an inner surface, wherein the inner surface of the housing defines a lens channel, wherein the inner surface of the lens channel defines: a contact point (414a, 414b) that protrudes outwardly from the inner surface into the lens channel, and a through hole, in the lens channel, which extends from the inner surface of the lens channel to an outer surface of the housing; and a contact point (414a, 414b) that protrudes outwardly from the inner surface into the lens channel, and a through hole, in the lens channel, which extends from the inner surface of the lens channel to an outer surface of the housing; and a lens barrel received in the lens channel, the lens barrel comprising an outer surface that defines: a first portion, a first platform that circumferentially rotates about a first central longitudinal axis of the lens barrel, wherein a radius of the first platform is greater than a radius of the first portion so that a first step is defined at a junction between the first platform and the first portion, a groove defined on the first platform, wherein the groove circumferentially rotates about the first central longitudinal axis of the lens barrel, a first portion, a first platform that circumferentially rotates about a first central longitudinal axis of the lens barrel, wherein a radius of the first platform is greater than a radius of the first portion so that a first step is defined at a junction between the first platform and the first portion, a groove defined on the first platform, wherein the groove circumferentially rotates about the first central longitudinal axis of the lens barrel,