... heterotyoe Automatic Round GluIing Robot single glue syringe /speaker, receiver, amplifier, buzzer Item: Automatic 3D Glue Robot( Single glue syringe) ... other single/double liquid heterotype (include round) trace glue sealing and welding,such as speakers, receivers, sounders, buzzers, etc..Optical Models( ... / Heterotype/ glue spray machine suitable for producing speaker, receiver, amplifier, buzzer