The eTiger ES-S6A is an extra indoor siren for your eTiger alarm system. This indoor siren works both in combination with the alarm system and independently. When you use it independently, you have to connect an eTiger sensor and remote control to the siren. In case of a detection, the siren receives a signal and an alarm signal sounds of 85 decibels. The indoor siren works on mains power and has a lithium back-up battery. That's how he always does it. With a transmission range of 80 meters you have enough options to place the siren.