Long service life and reliable build The loudspeaker is durable, reliable and firm, not easy to break or deform. Exquisite workmanship supports long-term use, and the sound is loud and clear to quickly grab attention. Usb port and mp3 support Built-in USB port allows playing music, pre-recorded speeches, or any message you want to tell your audience. Supports MP3 format. Sturdy and durable construction Full ABS shell provides rugged protection. Made of high quality material for durability. Lightweight design makes it easy to amplify your true voice anywhere. 20 watt power with siren This lightweight amplifier with siren provides 20 watts of power for clear, noticeable announcements. Use scenarios Great for New Year parties, barbecues, birthday parties, sporting events and other gatherings. Also suitable for outdoor assemblies, school events or public announcements at markets and community events.