The Model TRIP-1500L delivers a single siren sweep generating a minimum of 110 dB and its counterpart, the TRIP 1500 LB(G), generates six internationally recognized alarm sirens for almost every country in the world. They measure 53 mm in diameter and 60 mm high, deliver a sweep range from 1.5 to 4 kHz, and are rated at 12 Vdc within a range of 6 to 15 Vdc @ 250 mA maximum. Sealed construction of ABS plastic allows an operating temperature range of –20°C to +60ºC. Both come with a mounting bracket and color-coded wire leads. Pricing is less than $7 each/1,000. Transducers USA, Elk Grove Village, IL. (888) 921-6400.