Wheelock UTA-1 Universal Telephone Alert, Gray, Four Selectable Sound Patterns, High Output 104 dB Piezo Speaker, Tamper Resistant Volume Control, Dip Switch Selectable Wheelock Universal Indoor/Outdoor Loud Telephone Ringers: UTA-1 and UTA-WH-VPS are loud attention getting electronic ringers designed for use in noisy locations or for wide area coverage. The UTA-1 operates off the telephone ringer voltage Key Features: Four selectable sound patterns: Horn, Bell, Vibrating Chime, Single Chime High output 104 dB piezo speaker Tamper resistant volume control Dip switch selectable Low current draw and REN Approvals: UL Standard 1950 Multiple voltage activation Specifications Sound Patterns: Single chime/Horn/Bell/Vibrating chime Sound Level (dBA): Horn-104dB/Bell-100dB/Vibrating chime-97dB/Single chime-96dB Power Requirements: 24 VDC, 24 VAC, 48 VDC, 90 VRMS/20-30Hz