... FCC certificates : sound box, press button ,widely applied for promotional gift box, dolls, educational toys etc.Application: ... voice, temperature, timing, PIR, etc.Components:1. IC developed by YDL2. Speaker(20-40 mm), the size can be ... battery if required.4. PCB developed by YDL.5. Plastic housing made by YDL.YDL is ... team which made up of 25 engineers and 5 designers, this is why we can change our ...