Complete Upgrade Accessory Kit for Fosi Audio IM4 IEM Earphones

The Fosi Audio IM4 IEM Accessories is a premium upgrade accessory bundle designed specifically for the Fosi Audio IM4 in-ear monitors. This versatile kit includes a 4.4mm balanced cable, a 3.5mm cable with built-in microphone, and the compact D2 USB-C to 3.5mm DAC adapter, providing enhanced audio performance, greater compatibility, and improved everyday usability.

Whether you’re listening to HiFi music, gaming, making calls, or commuting daily, this accessory package delivers flexible connectivity and audiophile-grade sound quality for modern portable audio setups.

Premium 4.4mm Balanced Cable for HiFi Audio

The included 4.4mm balanced cable is engineered for cleaner signal transmission and improved audio performance.

Balanced Audio Benefits:

• Lower signal interference
• Reduced crosstalk
• Improved channel separation
• Wider soundstage
• Enhanced detail retrieval

The high-purity cable construction helps deliver:

• Clearer treble response
• Fuller bass performance
• Better instrument separation
• More immersive listening experience

Perfect for:

• Balanced DACs
• Portable HiFi players
• Audiophile amplifiers
• High-resolution music playback

3.5mm Cable with Built-In Microphone

The included 3.5mm audio cable features an integrated microphone for daily convenience and versatile mobile use.

Ideal for:

• Voice calls
• Online meetings
• Gaming communication
• Smartphone listening
• Portable everyday audio

The microphone cable allows the IM4 earphones to function as both audiophile IEMs and practical daily-use earphones.

D2 USB-C to 3.5mm DAC Adapter Included

The accessory bundle also includes the compact D2 USB-C DAC adapter for modern smartphones and USB-C devices without headphone jacks.

D2 DAC Features:

• USB-C digital audio input
• 3.5mm headphone output
• Plug-and-play operation
• Portable lightweight design
• Improved audio decoding quality

Compatible with:

• Android smartphones
• Tablets
• Laptops
• Portable gaming devices
• USB-C audio sources

This allows users to enjoy high-quality wired audio on modern mobile devices with improved sound performance over standard adapters.

High-Purity Cable Construction

The cables are designed with durable high-quality materials to ensure stable signal transmission and long-term reliability.

Cable Features:

• High-purity audio wire
• Low signal loss design
• Gold-plated connectors
• Anti-oxidation protection
• Soft flexible cable structure
• Anti-tangle construction

These premium materials help preserve audio quality while improving durability and user comfort.

Comfortable & Portable Everyday Use

Designed for modern portable listening, the IM4 accessory kit supports multiple use scenarios.

Perfect for:

• Daily commuting
• Portable HiFi listening
• Gaming setups
• Mobile calls
• Music streaming
• Laptop audio upgrades

The lightweight and flexible cables provide comfortable long-term use without excessive cable stiffness or tangling.

Plug-and-Play Simplicity

No modification or complicated setup is required.

Easy Compatibility:

• Direct IM4 compatibility
• Plug-and-play connection
• Quick cable swapping
• Seamless DAC integration
• Portable audio convenience

Users can instantly switch between balanced listening, mobile calls, or USB-C audio playback depending on their setup.

Technical Specifications

• Product Type: IM4 IEM Accessories Kit
• Compatible Model: Fosi Audio IM4 IEM
• Included Accessories:
  • 4.4mm Balanced Cable
  • 3.5mm Cable with Microphone
  • D2 USB-C to 3.5mm DAC Adapter
• Connector Type:
  • 4.4mm Balanced
  • 3.5mm Single-Ended
  • USB-C DAC Input
• Cable Features:
  • High-purity wire
  • Gold-plated plugs
  • Soft anti-tangle design
  • Low signal loss

Key Features

• Complete IM4 accessory upgrade kit
• 4.4mm balanced audiophile cable
• 3.5mm cable with microphone
• D2 USB-C DAC adapter included
• High-purity low-loss audio wire
• Gold-plated anti-oxidation connectors
• Plug-and-play compatibility
• Portable HiFi audio solution
• Comfortable anti-tangle cable design
• Ideal for music, gaming, and calls

Select Options	IM4 4.4mm Balanced Cable, IM4 3.5 Microphone Cable, D2 USB-C to 3.5mm DAC