extern void buz_init(void);
extern void buz_beep(time_t time);
extern void buz_repeat_start(time_t duration, time_t interval);
extern void buz_repeat_stop(void);
extern void buz_init(void);
extern void buz_beep(time_t time);
extern void buz_repeat_start(time_t duration, time_t interval);
extern void buz_repeat_stop(void);