Countdown timer function
No.	Function List	Button			Description and Display
1	current time/4 group alarm each day	ALM	SET	ADJ	display current time, set 4 group alarms with "Di Di", alarm each minute within 30 minutes since countdown time
2	XXX DAYS+HH:MM:SS	ST/SP	SET	ADJ	0~399 days +current time/remaining time
3	MM：SS	ST/SP	SEC	MIN	0~99 Minute  59 Second  COUNTDOWN
4	HH:MM	ST/SP	HOUR	MIN	0~99 Hour 59 Minute COUNTDOWN
5	60SEC	ST/SP			60 SEC COUNDOWN
5	0-99MIN	ST/SP	SEC	MIN	0-99 minute COUNTDOWN
6	7 DAYS+HH:MM:SS	ST/SP			COUNT DOWN DAYS+ remaining time
7	21 DAYS+HH:MM:SS	ST/SP			COUNT DOWN DAYS+ remaining time
8	30 DAYS+HH:MM:SS	ST/SP			COUNT DOWN DAYS+ remaining time
1st version IC function list
01    10SEC countdown
02    20SEC countdown
03    30SEC countdown
04    45SEC countdown
05    60SEC countdown
06    90SEC countdown
07    120SEC countdown
08    150SEC countdown
09    300SEC countdown
10    600SEC countdown
11    10Minute countdown
12    20Minute countdown
13    30Minute countdown
14    45Minute countdown
15    60Minute countdown
16    90Minute countdown
17    120Minute countdown
18    150Minute countdown
19    180 Minute countdown
20    XXXX（HH）  0-9999 hour countdown
21    XXXX（MM）  0-9999 Minute countdown
22    XXXX（SEC） 0-9999 Second countdown
23    XX：XX（MM：SS） 0-99Minute：59 second countdown
24    XX：XX（HH：MM） 0-99Hour：59 Minute countdown
25    XXX（DAY） 0-999 day countdown