Teho-Ulvo D-Series
Teho-Ulvo series contains electronic outdoor warning sirens, created by the Finnish company Elektro-Arola Oy in 1991. The alarms from the high-power speakers are achieved using a computer-optimized program ("VORO" control software in Finland). Teho-Ulvo D consists of two parts: central unit with control and amplifier electronics and horn speaker set normally installed with a mast pipe. D2400's sound range reaches 1,248 m (4094,8 ft), and the smallest model, D600 reaches 761 m (2496,7 ft). Since circa 2012, the sirens' controllers have been modernized, which resulted in a new sound. Teho-Ulvo's have been installed in Saudi Arabia, with the speakers set more separate.
Models
| Model | Image | Speakers |
|---|---|---|
| D600 | 6-8 (4x2-8) | |
| D1200 | 12-16 (12x2, 16x4) | |
| D1800 | 18-24 (18x6, 24x8) | |
| D2400 | 24 or 32 |