Last for 240hrs
- if u use 10 hours today, and after half a mth use again, u still have 230hours. Remember not to throw the plastic bag, keep well in the plastic bag after each usage
- Refer to graph for the effectiveness 1st opening the effectiveness is 100%,;24hours 84%;48 hours 79%;72 hours 73%;96 hours 60%;120 hours 55%;192 hours 49%;240 hours 42%
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