4-Way Sound Coverage: Roof-mounted 4-direction speaker design helps project announcements more evenly, making it ideal for mobile advertising, street promotion and vehicle broadcasting. Power Options for Different Needs: Available in 300W, 400W and 600W to match different promotion ranges, from everyday announcements to louder outdoor commercial use. Talk, Record and Play: Supports live microphone use plus recorded message playback, helping reduce repeated shouting and making mobile promotion more efficient. Easy Vehicle Setup: Magnetic mounting base and vibration-reducing support help simplify installation and improve stability for vehicle roof use during daily operation. Built for Mobile Promotion: Includes speaker unit, control system and remote-style operation for campaigns, store events, community notices and outdoor advertising tasks.