1. The innovation of digital recording and playback chip. 2. Innovative digital integrated circuit. 3. Imported Eco-friendly ABS material, the body is not easy to damage. 4. High temperature resistant and high quality speaker. 5. In a loud voice, and small distortion. 6. Strong power, wide audible range. 7. High voltage low power consumption and long service time. 8. With the recording time and playback function. 9. The preformance of megaphone is superior and stable.