| 摘要 |
Fastening devices disposed on a housing. Each of the fastening devices has a base, a fastening piece, a clamping piece, and an elastic piece. The clamping piece swings toward the base, and then a jamming portion of the clamping piece fastens a fastening portion of the fastening piece such that the fastening piece can be located on a fastening position and the base can be covered with the clamping piece. When users push the housing and the fastening devices into a installation hole of the ceiling, two braking portions of the fastening piece are swung downwardly by colliding with the ceiling such that the clamping piece is resorted to original position to be located on a released position via the elastic piece, and the clamping piece is opened from the base, so that an abutting portion of the clamping piece abuts against the ceiling.
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