--- product_id: 526238272 title: "B21 Series Switchback" brand: "auxbeam" price: "€ 60.43" currency: EUR in_stock: true category: "Auxbeam" url: https://www.desertcart.pt/products/526238272-b21-series-switchback store_origin: PT region: Portugal --- # 600% brighter output 4-layer cooling system CANBUS error-free tech B21 Series Switchback **Brand:** auxbeam **Price:** € 60.43 **Availability:** ✅ In Stock ## Summary > 🚗 Light Up Your Drive, Command the Road! ## Quick Answers - **What is this?** B21 Series Switchback by auxbeam - **How much does it cost?** € 60.43 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.pt](https://www.desertcart.pt/products/526238272-b21-series-switchback) ## Best For - auxbeam enthusiasts ## Why This Product - Trusted auxbeam brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **Plug & Play, Zero Error:** Built-in CANBUS resistor ensures no hyper flash or warning lights on standard US sockets—hassle-free upgrade. - • **360° Full Beam Coverage:** No dark spots or shadows—complete illumination for enhanced road safety and unmistakable signaling. - • **Advanced Thermal Management:** Quad-layer cooling with silent 12,000RPM fan, copper ring, heat sinks & aviation aluminum for 60,000-hour lifespan. - • **Dual-Color Switchback Magic:** Seamlessly switch between crisp 6500K white for DRL/parking and vivid amber for turn signals—stand out safely. - • **Brilliantly Bright & Noticeable:** 600% brighter 28W LEDs with 36 premium 3030SMD chips for instant-on, high-impact visibility. ## Overview Auxbeam B21 Series 3157 Switchback LED Bulbs deliver ultra-bright dual-color lighting with built-in CANBUS error-free technology, advanced cooling for longevity, and 360-degree full illumination. Designed for easy plug-and-play installation on standard US sockets, these bulbs enhance vehicle safety and style with instant-on white and amber signals, perfect for the discerning driver who demands performance and reliability. ## Description Buy Auxbeam B21 Series 3157 Switchback LED Bulbs Built in Resistor Error Free | White and Amber, Anti Hyper Flash, 600% Bright, T25 3057 3457 4157 Bulbs with Fan, Turn Signal Light Light DRL Parking Light: Turn Signal Bulbs - desertcart.com ✓ FREE DELIVERY possible on eligible purchases ## Features - CANBUS ERROR FREE: Super compatible for standard sockets rather than CK sockets. No hyper flash, no warning. With built-in CANBUS system, the 3157 dual color bulbs can alleviate decoding problems. Note: NOT fit TOYOTA TUNDRA and TOYOTA TACOMA. For super few sensitive models such as Silverado, RAM 1500/2500/3500 and Ford F150/F250/F350, extra resistors are needed or get from us - 600% EXTREMELY BRIGHT: Sequencing 36Pcs Upgraded high brightness 3030SMD chips precisely around each 3157 led bulb, 28W per bulb, High Power and 600% brighter, providing 6500K White light or 3500K Amber Yellow light. Instant-on response without warm-up time. More noticeable when turning, guard your driving safety - DUAL COLOR FUNCTION: This 3157 switchback led bulb with resistor lights up cool white for parking lights or daytime running lights (DRL) but amber yellow for turn signal lights. Unlike most turn signals flashing amber-white-amber-white on the market, the Auxbeam 3157 turn signals flash amber-off-amber-off, making it easier to see from a distance - 4-LAYER COOLING SYSTEM: IP68 waterproof and dustproof. The built-in stable current IC driver avoids digital or VHF radio signal interference. The latest cooling system - 12,000RPM silent fan plus Copper cooling ring plus 16Pcs heat sinks plus 6063 aviation aluminum lamp body directly doubles heat dissipation, ensuring longer lifespan up to 60,000 hours - NOT FIT CK SOCKETS: Only compatible with US standard sockets. Please refer to the CK sockets precautions on the pictures. Designed to be polarity sensitive, and if the bulbs don't light up, please flip the plug and try again. Fit socket 3157, 3157A, 3157NA, 3057, 3057A, 3457, 3457A, 4057, 4157, 4157NA, T25, etc. No drilling, no wiring, no damage, just Plug and Play - 360 DEGREE FULL CLEAR BEAM: Each 3157 led bulb provides 360 degree full illumination without dark spot or shadow, ensuring comprehensive visibility and enhanced safety for your vehicle lighting needs ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B0BZ45WLRZ | | Auto Part Position | Front | | Automotive Fit Type | Universal Fit | | Best Sellers Rank | #10,901 in Automotive ( See Top 100 in Automotive ) #20 in Automotive Turn Signal Bulbs | | Brand Name | Auxbeam | | Color | Amber White | | Color Temperature | 6500 Kelvin | | Customer Reviews | 4.3 4.3 out of 5 stars (1,748) | | Fit Type | Universal Fit | | Included Components | 2x 3157 LED Bulbs | | Item Highlight | White and Amber, Anti Hyper Flash, 600% Bright, T25 3057 3457 4157 Bulbs with Fan, Turn Signal Light Light DRL Parking Light | | Light Source Type | LED | | Manufacturer | Auxbeam | | Manufacturer Part Number | B21-3457-AW | | Manufacturer Warranty Description | 1 Year Warranty | | Model Number | AUXBEAM-B21-3157 | | OEM Equivalent Part Number | 3047, 3047R, 3057, 3057A, 3057R, 3057NA, 3157, 3157A, 3157R, 3157K, 3157NA, 3157NAK, 3157NALL, 3357, 3457, 3457A, 4057, 4057R, 4157, 4157A, 4157R, 4114, 4144, T25 | | Operating Life | 60000 hours | | Package Quantity | 1 | | Specific Uses For Product | Daytime Running Light, Indicator Light, Parking Light | | Unit Count | 2 Count | | Voltage | 12 volts_of_direct_current | | Wattage | 28 watts | ## Product Details - **Brand:** Auxbeam - **Color Temperature:** 6500 Kelvin - **Light Source Type:** LED - **Specific Uses For Product:** Daytime Running Light, Indicator Light, Parking Light - **Wattage:** 28 watts ## Images ![B21 Series Switchback - Image 1](https://m.media-amazon.com/images/I/71-E08XgcNL.jpg) ## Available Options This product comes in different **Size** options. ## Frequently Bought Together - Auxbeam B21 Series 3157 Switchback LED Bulbs Built in Resistor CANBUS Error Free Anti Hyper Flash T25 3057 3457 4157 Bulbs White and Amber 600% Super Bright Turn Signal Light DRL Parking Light - Auxbeam T25 3156 3157 LED Bulbs, 6500K White, Super Bright 4114 3057 4157 3457 4057 LED Backup Reverse Lights for Cars Trucks Motorcycles, 3030-SMD 12V, Pack of 2 - Auxbeam H10 9140 9145 Fog Lights, 10000LM 600% Brighter H10 9040 9045 Fog Light, 6500K White Strong Light Penetration, Super Bright Plug and Play --- ## Why Shop on Desertcart? - 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016 - 🌍 **Shop Globally** — Access 737+ million products across 21 categories - 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price - 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members) - 🔒 **Secure Payments** — Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.pt/products/526238272-b21-series-switchback](https://www.desertcart.pt/products/526238272-b21-series-switchback) --- *Product available on Desertcart Portugal* *Store origin: PT* *Last updated: 2026-09-16*