This siren is made with a UV stabilised ABS body and BKV Glass filled Nylon impellor, the 3rd generation 1000m siren since the original Sirenco 1000 was introduced in 1980. The low frequency sound has excellent travel characteristics and is ideal for longer distances in noisy environments. The unit comes with a M20 gland for safe cable connection and a mounting bracket with slotted holes for ease of instalation.