... 10mg Prallethrin/PC insect tablet60pcs/box Usage: Put the tablet into the heater,plug it in and the indicator ... heater begin to work. Each tablet can use 12hours,after 12hours using,the tablet should be changed.removing the ... mosquito.it can work at once after heating.the tablet can last 12 hours and let you have a ... 2-3 years,if it can not change the tablet color or just change a little after one night ...