1. Tone charactor: Siren, manual, wail, yelp, hi-lo, horn, radio. 2. Handhold mike, with controller. 3.Monolithic integrated 1. It conform to national standrad GB8108-1999.2. Tone charactor: Siren, fire, tool, wail-2, yelp, hi-lo, wail-1, horn.3. Handhold mike with control mike.4. Monolithic integrated circuit in steadier performance.5. Technical data: Voltage: 12V/24VPower: 100wImpedance: 8Ω ...