| 摘要 |
A medical delivery device comprising an electronic circuit system 7900 coupled to a housing 7110, including a speaker 7956 and a cover 7170, wherein the speaker 7956 produces a first audible output OP21 from the front portion 7004, and a second audible output OP22 from the back portion 7003, each audible output having its own exit path, the exit paths being of different lengths such that the first and second audible outputs are substantially in phase with one another as they exit the exit paths. The device may comprise a moveable member, configured to either cover or lie within at least one of the exit paths in a first position, and away from said exit path in a second position. The audible output may be configured to be produce when a safety lock is moved from a first to a second position. |
