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![Blue Sea 1839 M2 OLED Tank Monitor [1839]](https://cdn.shopify.com/s/files/1/0405/8454/4408/products/64341XL.jpg?v=1591322113)
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Ships within 48 hours · Estimated delivery Jun 28 - Jul 3
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Description
Blue Sea 1839 M2 OLED Tank Monitor [1839]M2 OLED Tank Monitor The M2 Organic LED Digital Monitor measures essential electrical system parameters with adjustable alarms and an auto dimming display. The M2 Monitors include a MOSFET External Circuit Relay (ECR) which can be used to control external circuits based on any value measured by the M2. Features: Auto dimming, bright Organic LED display is easy to read 80dB alarm on all models Isolated 500mA MOSFET relay Includes external DC Shunt or
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- Free Standard Shipping on $100+ Orders to the USA.
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Exchange/Return Notes
- We offer a 30-day return/exchange service after receiving.
- Final sale items are not eligible for returns or exchanges.
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![Blue Sea 1821 Universal Temperature Sensor [1821]](https://cdn.shopify.com/s/files/1/0405/8454/4408/products/64340XL.jpg?v=1591322104)
Best in 7 days
4.7 ★★★★★
Based on 1943 reviews
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Product Reviews
★★★★★ 5
Perfect for on the go use.
The Lisen Wireless charger is perfect for on the go pop in and pop out when needed. It’s very functional and only needs one hand use to lock or unlock. It fits perfectly on the air vent. It’s look sleek and well made. The charging speed may be slow unfortunately.
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Reviewed in the United States on April 26, 2026
★★★★★ 4
Good, except for release button placement
This works well. It’s easy to install, charges your phone well, and mounts to the vent securely. Simply set your phone on it and squeeze the arms to grip it. I like that it’s manual, so you can open and close it even without power.
However, the release button is centered on the back, which means that to press/squeeze it, you have to put your thumb right on the middle of your phone screen. It can interfere with whatever I’m using my phone for at the time or just wake it up unnecessarily. Not a huge deal, but it would be great if they moved the button to the side so you can squeeze side to side to release the grip, rather than front to back.
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Reviewed in the United States on September 22, 2025
★★★★★ 5
Great product if you’d like to talk and keep your phone charged at the same time
I really really like these. I have two one in my truck one in my car I like it because I can put my headphones in while it’s being charged so I can talk on long drives like four hour drives and the battery never goes dead and I have the ability to utilize the plug-in. I don’t like Wi-Fi. I have a tendency to lose them so I like old-fashioned wire it just is my preference.
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Reviewed in the United States on March 22, 2026
★★★★★ 5
Muy buena calidad lo llevo usando por mucho tiempo y aún funciona.
Carga rápido y sostiene muy bien el celular
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Reviewed in the United States on May 13, 2026
★★★★★ 5
Great Charger
Great wireless car charger holder. No more fidgeting for phone
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Reviewed in the United States on January 30, 2026
