Specification Brand : Hyuduo BulletPoint : science lab spectrometers BulletPoint1 : [Dc Voltage between 5v and 12v] - Power this meter with ease, backed by reverse connection for added safety. BulletPoint2 : [Reverse Connection ] - Equipped with a diode to prevent circuit damage from reverse power supply polarity. BulletPoint3 : [Led Display] - The led lights up from bottom to top based on sound intensity, creating a dynamic visual experience. BulletPoint4 : [Independent Comparator Circuit] - Ensures a Durability-Optimized with a simple yet effective structure. BulletPoint5 : [Voice-activated Sensor] - No audio connection needed, just power on and watch it flash along with sound. ExternallyAssignedProductIdentifier : 7902138745675 IncludedComponents : No ItemName : Voice Control LED VU Meter Prevent Burning Anti Reverse DC 5V 12V Powered Music Flashing Light With Voice Activated Sensor for Sound Level Testing ItemPackageDimensions_Height : 3 centimeters ItemPackageDimensions_Length : 11 centimeters ItemPackageDimensions_Width : 4 centimeters ItemTypeKeyword : sound-and-noise-meters Manufacturer : Hyuduo ModelName : Hyuduosnzeq36i0g ModelNumber : Hyuduosnzeq36i0g NumberOfBoxes : 1 NumberOfItems : 1 PartNumber : Hyuduosnzeq36i0g PowerSourceType : ac/dc ProductDescription : Spec: Item Type: VU Meter Material: Plastic Size: Length 10cm / 3.9in x width 3cm / 1.2in; Lamp Beads: 5mm Round Head Fog-like Led, Uniform and Not Dazzling (multi-color Optional); Power Supply: DC 5V-12V is Available, the Board Comes with a Microusb Socket, You Can Use the Corresponding Mobile Phone Charging Cable to Plug in the Power Supply, and 2 Pad Ports Are Reserved for Users to Wire Their Own Wires;