Abstract: A lens adjustment device for a scope includes an elongated tubular body having an objective end portion and an eyepiece end portion so as to define a rotation axial therealong, a first lens group and a second lens group slidably and operatively assembled at the objective end portion and the eyepiece end portion respectively, a first controller arranged for controlling the first lens group and the second lens group, and a second controller arranged for controlling the second lens group individually. The first controller and the second controller are arranged adjacently with each other on the outer tubular casing of the scope facilitating the adjustment operation of the scope so as to enable one-hand operation.

Abstract: A lens adjustment device for a scope includes an elongated tubular body having an objective end portion and an eyepiece end portion so as to define a rotation axial therealong, a first lens group and a second lens group slidably and operatively assembled at the objective end portion and the eyepiece end portion respectively, a first controller arranged for controlling the first lens group and the second lens group, and a second controller arranged for controlling the second lens group individually. The first controller and the second controller are arranged adjacently with each other on the outer tubular casing of the scope facilitating the adjustment operation of the scope so as to enable one-hand operation.

Abstract: Provided are a method, system and relevant device for realizing a virtual SIM card. The method includes steps of: when a mobile terminal requests to access a communication network, connecting to a cloud service terminal through a wireless network; after the mobile terminal receives an authentication request sent by the communication network, requesting the cloud service terminal to perform authentication calculation and feeding an authentication result obtained by the authentication calculation back to the mobile terminal; and the mobile terminal sending the received authentication result to the communication network. The solution realizes a mobile terminal with a virtual SIM through a cloud service, and on the basis of inheriting the security of a physical SIM card, not only the production and mounting costs of a SIM card slot are reduced, but also the mobile terminal is allowed to be lighter, thinner and more portable.