The Privest Wireless Indoor Siren is the all-in-one module from ABUS Security-Center. You can install this combination signal generator indoors. The signal is transmitted to and from the alarm control panel via wireless technology. In the event of an alarm, the siren generates an extremely loud tone (more than 105 dB of acoustic pressure). The stable housing is tampering-protected by wall contact and lid contact. The power supply is already integrated in the housing (5 x CR123, 3 V lithium battery).