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                       Q6. How about the battery life RF sensor RFT-6 and Infrared sensor IRT-6? | 
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                          How to check battery states of them? | 
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                       RFT-6 and IRT-6 adopted ultra-low power  design. | 
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                       Battery life of RFT-6 is more than 3 years,  by using two AA alkaline batteries (1.5V*2). | 
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                       Battery life of IRT-6 is more than 15  months, by using two AA alkaline batteries (1.5V*2). | 
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                       Battery state can be checked on AG-600. | 
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                       It will appeared “ ” on AG-600, when AG-600 triggered by RFT-6,  and this is battery level of RFT-6. | 
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                       It will appeared “ ” on AG-600, when AG-600 triggered by IRT-6,  and this is battery level of IRT-6.  | 
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