Key button mechanism and electronic device using same

An electronic device, comprising:

• a housing including a main body and a sidewall, two opposite latching members protruding from an inner surface of the sidewall, each latching member defining a latching groove, two retaining poles protruding from the inner surface of the side wall;
• a printed circuit board mounted to the housing, the printed circuit board comprising a switch;
• and
• a key button mechanism, comprising:
• a retaining board defining two retaining holes, portions of the retaining board retained to the latching grooves of the housing and each retaining pole retained in one of the retaining holes;
• a sliding board slidably mounted to the retaining board, the sliding board being capable of sliding between a first configuration and a second configuration;
• a key button fixed to the sliding board so the key button slides relative to the retaining board with the sliding hoard, the key button comprising an actuator;
• and
• a stopping member located between the retaining board and the sliding board, the stopping member holding the sliding board in the first configuration or the second configuration;
• wherein when the sliding board slides from the first configuration to the second configuration, the switch is actuated by the actuator.