SPY one way alarm

[s0n1c]

Hi. I'm using a one way SPY alarm for my fz6 2006. recently i found that the sound of my siren kinda soft now. dont know why. My batt status is ard 12.5-12.6 when i goin work in the morning. So could it be my batt prob or something wrong with the alarm.? help help~ Thks.