Includes all taxes
Feature
1. Dual-Magnet Dual-Cavity Driver
The Fosi Audio IM4 features a dual-magnet dual-cavity driver that delivers great resolution and high impulse fidelity. This design ensures the purity of sound and a wide dynamic range, allowing you to enjoy the clarity and depth of every note.
2. Open-Back Design
The open-back design of the IM4 creates an open, natural soundstage, ensuring that you won't experience fatigue even during extended listening sessions. This design makes music sound more natural and provides a more comfortable listening experience.
3. Balanced Tuning across Genres
Carefully tuned for long listening sessions with natural sound across various music genres, the IM4 delivers a natural sound that keeps your ears comfortable for hours. Whether it's pop, rock, or classical, it provides a balanced and enjoyable listening experience.
4. Ergonomic Build for Comfort
Weighing only 7 grams, the IM4 is designed with an ergonomic build ideal for all-day wear. Its lightweight design and comfortable earbuds ensure that you won't feel discomfort even after prolonged use.
5. CNC Aluminum Alloy Housing
The IM4 features a CNC aluminum alloy housing that is not only refined in appearance but also skin-friendly with a premium texture. This high-quality material and craftsmanship ensure the durability and premium feel of the earphones.
Specifications
Shell Material:6063 CNC Aluminum Alloy
Driver Unit:
10 mm N52 Dual-Magnet
Dual-Cavity Dynamic Driver
Diaphragm:PU Beryllium-coated Diaphragm
Sensitivity:109dB/mW
Impedance:21Ω
Frequency Response:20Hz-20kHz
Cable:
4-core 392-strand 5N OFC Silver-plated Copper Cable
Connector:2-PIN 0.78mm
Audio Jack:3.5 mm Gold-plated Plug
Weight (per earbud):7g ±0.5g
Weight (incl. cable):38g ±1g






















Payment Policy – BILLIONS BIRDS
At BILLIONS BIRDS, we are committed to providing a safe, secure, and seamless payment experience for our customers.
1. Accepted Payment Methods
We accept the following payment options:
Major Credit & Debit Cards (Visa, MasterCard, American Express)
Secure Online Payment Gateways (such as PayPal, Stripe, or other providers available at checkout)
Any additional payment methods displayed during checkout
All payments must be completed in full at the time of purchase.
2. Secure Transactions
All transactions are processed through encrypted and secure payment systems to protect your personal and financial information. We do not store your full payment details on our servers.
3. Currency
Prices are displayed in the currency indicated on the website. If you are purchasing from another country, your bank may apply currency conversion fees.
4. Order Confirmation
Once your payment has been successfully processed, you will receive an order confirmation email containing your purchase details.
5. Failed or Declined Payments
If your payment is declined, please verify your billing information or contact your bank. Orders will only be processed after successful payment confirmation.
6. Fraud Prevention
BILLIONS BIRDS reserves the right to cancel or refuse any order if fraud or unauthorised activity is suspected.
Delivery Policy – BILLIONS BIRDS
At BILLIONS BIRDS, we are dedicated to delivering your orders safely and efficiently.
1. Order Processing
All orders are processed within 1–3 business days after payment confirmation. Orders are not processed or shipped on weekends or public holidays.
2. Shipping Times
Estimated delivery times vary depending on your location:
Domestic Shipping: 3–7 business days
International Shipping: 7–15 business days
Please note that delivery times are estimates and may vary due to customs procedures, carrier delays, weather conditions, or other unforeseen circumstances.
3. Shipping Costs
Shipping fees are calculated at checkout based on your location and selected shipping method. Any customs duties, taxes, or import fees are the customer's responsibility.
4. Tracking Information
Once your order has been shipped, you will receive a confirmation email with tracking details (if available) so you can monitor your package.
5. Delivery Issues
If your order is delayed, lost, or arrives damaged, please contact us within 7 days of the expected delivery date. We will work with the shipping carrier to resolve the issue as quickly as possible.
6. Incorrect Shipping Information
Customers are responsible for providing accurate shipping details at checkout. BILLIONS BIRDS is not responsible for orders shipped to incorrect addresses provided by the customer.
Refund Policy – BILLIONS BIRDS
At BILLIONS BIRDS, customer satisfaction is our top priority. If you are not completely satisfied with your purchase, we’re here to help.
1. Return Eligibility
You may request a return within 14 days of receiving your order. To qualify for a return:
The item must be unused, unworn, and in the same condition as received.
The item must be in its original packaging.
Proof of purchase (order confirmation or receipt) is required.
Certain items may not be eligible for return, including clearance items, gift cards, or personalised/custom products.
2. Non-Refundable Items
The following items are non-refundable:
Final sale or discounted items
Gift cards
Items damaged due to misuse, negligence, or improper care
3. Return Process
To initiate a return, please contact our customer support team with your order number and reason for return. If your return is approved, you will receive instructions for returning the item.
Unless the item is defective or incorrect, customers are responsible for return shipping costs.
4. Refund Processing
Once we receive and inspect your returned item:
We will notify you of the approval or rejection of your refund.
If approved, the refund will be issued to your original payment method within 5–10 business days.
Please note that banks or payment providers may require additional time to process refunds.
5. Damaged or Incorrect Items
If you receive a damaged, defective, or incorrect item, please contact us within 7 days of delivery and provide clear photos of the product and packaging. We will arrange a replacement or full refund at no additional cost.
6. Late or Missing Refunds
If you have not received your refund:
Check your bank account again.
Contact your credit card company or payment provider.
If the issue persists, don't hesitate to contact our support team for assistance.
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