Features:This speaker can be connected to a computer through a USB cable to change the voice, builtin 4M capacity.High MP3 sound quality. Support loading MP3 audio format playback, beautiful sound quality.IP65 level protection. Rainproof, dust proof and shockproof, can work normally in bad environment.Loud alarm sound. Loud and clear115dB alarm, with 10W amplifier, it can work continuously for a long time.Support multi trigger playback. It can be extended to various triggering modes, 5 trigger ports can set different triggering modes at will.Made of ABS plastic shell, good corrosion resistance.Specifications:Voltage: DC 12VMaterial: ABS PlasticsColor: BlackVolume: 115dbWorking Current: 850mAAudio Format: MP3 FormatAudio Power: 10W/8Memory: Built in 4M bit for SPI Flash MemorySize: Approx. 6.8 x 10.0 x 8.2cm/2.7 x 3.9 x 3.2inPackage Weight: 424g/15.0ozPackage List:1 x Siren Horn.