security emergency alarm 1. good performance emergency alarm 2. OEM/ODM service 3. 1 year warranty alarm 4. CE certificate security emergency alarm Model:HHS-2100Voltage: 12VPower : 100-300wImpedance: 4Ω,6Ω,8ΩSound compression: 120~130dBSound compression level : 120~130dBhigh quality,Typically for polic car ,emergency ,rescue and project use .It has different tone for security, fire fighting, ...