a housing comprising an opening;

a circuit board disposed in the housing;

an image sensor electrically connected to the circuit board;

a light-control member configured to change light transmittance from a light transmission state capable of transmitting external light to a light reflection state capable of reflecting light according to application of power; and

a contact member disposed adjacent to the opening and allowing light to pass therethrough,

wherein, when viewed from a lateral side, the light-control member is disposed such that a longitudinal extension line of the light-control member and a longitudinal extension line of the contact member form a predetermined angle therebetween,

wherein, when the light-control member is in the light transmission state, the image sensor is disposed to obtain an image over the light-control member, and

wherein, when the light-control member is in the light reflection state, the image sensor is disposed to receive light reflected by the light-control member and light directly incident through the contact member.