Name: OtterBox - Theorem Series for Microsoft Surface Duo - Black
Brand: OtterBox
SKU: 6422085
Rating: 2.7 (44 reviews)

Key Specs
- Brand Compatibility: Microsoft
- Model Compatibility: Microsoft Surface Duo
- Case Style: Folio
- Integrated Stand: true
General
- Product Name: Theorem Series for Microsoft Surface Duo
- Brand: OtterBox
- Model Number: 77-80500
Compatibility
- Brand Compatibility: Microsoft
- Model Compatibility: Microsoft Surface Duo
Features
- Case Style: Folio
- Integrated Stand: true
- Material: Synthetic Leather
Dimensions
- Product Width: 0.89 inches (The out of box width of the item. Width is measured as the horizontal distance from one side of the item to the other as it would be primarily used or placed.)
Other
- UPC: 840104230350

Otterbox Theorem Series for Microsoft Surface Duo. Theorem Series is a celebration of foldable devices from Otterbox for mobile technology protection. The premium, durable material protects your device from scratches and scrapes while the thin, versatile folio folds out of the way and converts into multiple stand angles for comfortable typing and hands-free viewing. Interior adhesive pad holds your bare device securely in place for easy install and productivity on the go.

Designed for use with the Microsoft Surface Duo smartphone: Protects and complements your phone.
Adaptable design: Supports multi-position device functionality for hands-free use.
Durable protection: Scratch and scrape resistant case protects your device.
Interior adhesive pad: Holds device securely in place.
Additional case features: Easy install. Built-in card and Surface Pen holder for all-in one convenience. Works with Surface Duo Bumper (included with case).

Whats Included

Cell Phone Case
Surface Duo Bumper

Q: The Otterbox site says it works with the bumper case, but does not indicate it comes with one. This description says it does. Does it?

A: The phone comes with the bumper.

Q: I see reviews pen holder is too small and case does not close property with pen. Will pen holder will become loose enough to hold surface slim pen and case will close with pen if I use it for a while?

A: Anything given enough time will loosen up. Don’t buy it hoping that to happen soon. The case also gets in the way of folding the phone to take calls. Do not buy.

Customers are saying

Customers express satisfaction with the protection offered by the Theorem Series case for the Microsoft Surface Duo. However, many customers cite issues with the case fit and adhesive, finding the design awkward and the adhesive unreliable for long-term use. Concerns were also raised regarding the pen holder, with some users reporting it interferes with device functionality.

This summary was generated by AI based on customer reviews.

Customer Images

The vast majority of our reviews come from verified purchases. Reviews from customers may include My Best Buy members, employees, and Tech Insider Network members (as tagged). Select reviewers may receive discounted products, promotional considerations or entries into drawings for honest, helpful reviews.

Rated 5 out of 5 stars
Best case on the market for this device
The case provides perfect 360 drop protection when combined with the surface bumper, the bumper protects the edges and this case protects the exterior from damage. It is a stiff when first received so it takes some folding repeatedly to get comfortably flexible. The case is no different from a leather wallet or baseball glove in that sense. The only caveat to using this case with the bumper is due to the not flat nature of the bumper on side, the case needs to be worn in reverse to make the most of the suction tape (adhesive) in order to stick properly and consistently. The pen loop is pretty useless to anyone using the surface pen slim, but that is a non issue since the magnetic strap on the case closes both the case and secures the pen nicely on the exterior of the case. In order to make use of the 360 degree foldability (more like 330 degrees with this case) of the phone, the case needs to flat behind one side of the phone then the phone can be closed around that flattened side, this becomes more malleable as the user does it and easier over time. It is a little awkward at first but becomes second nature after a few days, only down side is one panel becomes exposed so handle with care. Otherwise I am really enjoying the case and it is a recommendation for people who want to properly secure this tech investment of 1400+ dollars.
Posted 5 years ago by Tmclemons
Rated 1 out of 5 stars
Not Otterbox Quality
This is a very awkward fit and poor design. The pen holder blocks the fingerprint reader and volume controls. When putting a Surface Slim Pen in the holder, the case flap will not completely close and latch properly. There's a spongy adhesive section on the right flap to hold the Duo in place--not sure how well this would stand up to removing from from case multiple times. Overall, this was a huge disappointment for an Otterbox product.
Posted 5 years ago by JW64
Rated 1 out of 5 stars
A waste of money.
The protection of the phone is solid. To use the phone to take calls, the phone has to fold the second screen back which this case doesn’t let you. The surface pen slim does not fit well, and when using it causes difficulty closing the case securely. It uses a command or 3m like tape to stick to the phone. If you take the phone out of the case more than once the tape is no longer sticky. I ended up throwing mine away.
Posted 4 years ago by LMinus