Specification AgeRangeDescription : Adult Brand : Q-BAIHE BulletPoint1 : [Two-stage gain switch]-This headphone amplifier enhances the signal input to the amplifier circuit to achieve the best performance of the headphone. It can not only output louder sound, but also output clearer and more realistic stereo without distortion BulletPoint2 : 【Rechargeable Lithium Battery】--Adopt 600mAH rechargeable lithium battery, which can keep the headphone amplifier working for more than 8 hours. In addition, there is a volume control knob to adjust the volume BulletPoint3 : [Portable and Lightweight]--This headphone amplifier is designed to let you enjoy music anytime, anywhere; the smooth, sturdy shell and chassis can achieve long-lasting use BulletPoint4 : [Wide compatibility]-This amplifier is very compatible with various digital devices, such as MP3, MP4, iPhone, iPod, iPad, computers, CD players and personal media players, Xbox one, PS4, PS5 controllers, etc. . BulletPoint5 : [Good sound quality]-restore the real sound quality with a wide dynamic range, reduce the distortion rate to create a wide and deep sound field, and the sound quality is delicate and accurate. BulletPoint6 : age range description : Adult Color : Red CompatibleDevices : AC-DC Converters CompatibleDeviceSizeMaximum : 27.8 millimeters CompatiblePhoneModels : such as MP3, MP4, iPhone, iPod, iPad, computers, CD players and personal media players, Xbox one, PS4, PS5 controllers, etc. . CompatiblePhoneModels1 : For Galaxy Buds FE(2023) CompatiblePhoneModels2 : For Galaxy Buds 2 Pro Case(2022) CompatiblePhoneModels3 : For Galaxy Buds Pro Case(2021) CompatiblePhoneModels4 : For Galaxy Buds 2 Case(2021) CompatiblePhoneModels5 : For Galaxy Buds Live Case(2020) ConnectivityTechnology : such as MP3, MP4, iPhone, iPod, iPad, computers, CD players and personal media players, Xbox one, PS4, PS5 controllers, etc. . ConnectorType : PS2 To HDTV Video Converter ControlMethod : touch CustomerPackageType : Standard Packaging ExternallyAssignedProductIdentifier : 6256294973993 ExternallyAssignedProductIdentifier1 : 728676525664 ExternallyAssignedProductIdentifier2 : 0728676525664 FormFactor : Case GpsrSafetyAttestation : 1 IncludedComponents : Aquila III IncludedComponents1 : AirPods Pro case IncludedComponents2 : Carabiner IncludedComponents3 : Anti-lost rope IncludedComponents4 : Lanyard IncludedComponents5 : Cleaning pen InputVoltage : 5 volts_of_direct_current InterfaceType : USB ItemName : New New Portable Headphone Amplifier with Subwoofer HiFi and AUX Audio Adjustment ItemPackageDimensions_Height : 10.7 centimeters ItemPackageDimensions_Length : 4.3 centimeters ItemPackageDimensions_Width : 9.4 centimeters ItemPackageQuantity : 1 ItemTypeKeyword : headphone-amps Manufacturer : ZMT-Headphone-AMP Material : Ethylene Vinyl Acetate ModelNumber : ZMT-Headphone-AMP NumberOfBoxes : 1 NumberOfItems : 1 NumberOfPorts : 1 OutputCurrent : 2.4 amps OutputVoltage : 5 volts_of_direct_current PackageLevel : unit PartNumber : ZMT-Headphone-AMP Pattern : Solid PowerSourceType : Battery Powered ProductDescription : Specifications: Support most high-impedance 16-300Ω headphones, 3.5mm AUX input and output, signal-to-noise ratio>100Db, THD+N=0.0003%, fully filter out noise, and enjoy high-quality audio [Two-stage gain switch]-This headphone amplifier enhances the signal input to the amplifier circuit to achieve the best performance of the headphone. It can not only output louder sound, but also output clearer and more realistic stereo without distortion 【Rechargeable Lithium Battery】--Adopt 600mAH rechargeable lithium battery, which can keep the headphone amplifier working for more than 8 hours. In addition, there is a volume control knob to adjust the volume [Portable and Lightweight]--This headphone amplifier is designed to let you enjoy music anytime, anywhere; the smooth, sturdy shell and chassis can achieve long-lasting use