... 2.Support 10W audio output 3.color:black,red Alarm Horn, Car Alarm, Alarm Siren FeaturesAudio format : wav , 16bit, mono ,sampling ... our downloader .Operating Voltage: DC9V ~ 24VRated output power: 10WattsSopport Key control and MCU Signal to noise ratio: ≥ 82db Size 10 ... our pruduct------------------Guangzhou Waytronic Let sound change life-------------------- Alarm Horn, Car Alarm, Alarm Siren