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All the led bulbs are sold on one pair, with two bulbs. (Except for after-sales replacements)

Bullet B1 is with single white 6500k color, and Bullet B4 has 6500k 4300k 3000k 3 colors.

If it has the same model like headlight, the answer is YES.

A. Boslla LED bulbs are working between 9 to 16V, but the Daytime Running light works on about 7V. So it is not recommended to install on the daytime running light because it may have a flickering with an error on the dashboard, or can’t turn on.

If your vehicle’s headlight bulbs have a DRL function, please ensure you turn the DRL function off and only use the headlights in the “on” position.

B. To fix the problem, you can add our capacitor/resistor to check. But we can not 100% guarantee it works.

Some cars, such as the 2007+ Dodge, Chrysler, Jeep, GMC, BMW, Mercedes-Bens, may has a flickering or dashboard error when upgrade to leds. You can take our resistor or capacitor decoder to clear it.

If encountering the situation that the bulb does not work suddenly but works well again after turning off the power and restart it, please consider changing the dust cover with more space for heat dissipation.

If the BOSLLA LED Kits do not light up(Single Beam Bulb like H1, H3, H7, H8/9/11/16, H10, 9005, 9006, 9012, 5202, 880, 881, etc.). please simply disconnect, flip the plug to reverse the positive and negative, and reconnect.

If the LED lights up but flickers, strobes, “error code” on the dashboard, or radio interference etc., then you are experiencing a rare voltage regulation issue which can be solved by adding a DECODER( capacitor or resistor) to set up. Buy here.

>>Boslla Product Manual

If the bulbs you purchase do not fit your headlights, please contact us and provide your Order Number, Vehicle Make/Model/Year and some photos of your original bulbs, we will help to check and find the right size.

If your use H7 bulbs that come with a retainer clip, you can check and find your suitable adapter/retainer HERE.

>>Boslla Product Manual

Please send us some photos and videos to show the issue, we will help to check and solve it best.We will ask you to do some tests as well as some videos for the problem checking, hope for your understanding.

We support Paypal and Credit card payment methods.

We offer free Standard post over $39 and free Express shipping over $199 for the U.S., UK, Mexico, Canada, and more. You can calculate the exact shipping fee at Checkout.

Standard Post – 3 ~ 14 business days
Express Shipping – 2 ~ 7 business days

Detailed information please check HERE.

We do not offer free shipping to some countries where we can not guarantee a cheap or reliable delivery service. However, we strive for increasing the number of countries eligible for our free shipping service, and you may discover that this option is available for your country in the near future.

Boslla employs a comprehensive logistics system under which it has partnerships with many world-leading international shipping companies including but not limited to DHL, UPS, FedEx, and 4Px. to offer a fast and convenient door-to-door delivery to more than 200 countries.

If we have asked you to verify your identity, this is to safeguard the security of your account and to prevent fraud. You will receive a notification e-mail from support@boslla.com asking to verify your identity.

Please reply and attach the following files to the same e-mail:
– A picture or a scan of your credit card showing only its last 4 digits and the cardholder’s name;

Please cover your personal information (birth date and similar ones) and your ID/passport/driving license number.

The information submitted will only be used to verify the authenticity of the cardholder’s identity, and will not be shared or sold to third parties.

Once your order has been shipped, you will receive an e-mail from us with the tracking code and a link where to track it (www.17track.net or http://track.4px.com/).

1. We want you to be completely happy with your purchase. If for any reason you are not satisfied, please return the item to us within 30 days of purchase for a refund.

2. Before you return, please contact our Customer Service firstly, we will get back to you within 24 hours. Please do not return the parcel to the shipping address on the parcel. Your patience and understanding will be highly appreciated.

3. Returns must be received in their original condition and packaging: unused, unworn, unwashed. Items returned with obvious use or product stains will be subject to refusal.

More information here>>

Boslla products are guaranteed against manufacturing defects for 1 year from the original date of receipt.

Our sole obligation in the event of such defects during this period is to repair or replace the defective part or product with a comparable part or product at Boslla’s sole discretion.

Upon expiration of their respective warranty periods, all Boslla products will receive continuing support through our limited lifetime warranty. The limited lifetime warranty covers labor costs and maintenance with the exclusion of accessories or replacement parts.

More information here>>