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Tingoton Voice Improvement Hearing Test Machine Audio Power Amplifier for Vra. DOT Certification: Product meets DOT safety and performance standards. Wireless Connector: Features wireless connectivity for flexible audio transmission. Wide Frequency Response: Covers 30Hz to 20kHz for full-range sound reproduction. OEM and ODM Support: Customization available from samples, designs, and full customization. Drop Shipping Service: Safety inventory maintained to support drop shipping requests. Flexible MOQ: Minimum order quantity of 1 piece accepted for most items. Fast Delivery: Lead time typically 5 to 15 days after advance payment.