X-10 Mini Powerhorn Security Siren (X-10 Pro PSH02, X-10 Powerhouse SH10A) Can be manually tripped from any X10 controller by toggling the unit code ON & OFF repeatedly Also can be used as an annunciator by pressing the Unit Code-ON and then pressing Dim or Bright. You will hear a ding or a dong for each button press. Loud 105dB siren