Disclosed herein is an apparatus. The apparatus includes a housing, electronic circuitry, a first arm member, and a spring. The housing includes a first housing section and a second housing section. The electronic circuitry is mounted in the housing. The first arm member is connected between the first housing section and the second housing section. The first arm member is configured to move a portion of the second housing section away from the first housing section. The spring is connected between the second housing section and the first arm member. The spring is configured to exert a torque between the second housing section and the first arm member.