Photos show this exact unit, including any signs of use.

Motorola SURFboard SB6121 DOCSIS 3.0 Cable Modem – High-Speed Internet
- ShippingDepends on item size and packaging.
- Local pickupAvailable in Taylorsville, UT.
This same item is also listed on
Same unit, same SKU.- Real photos
- Tested in Utah
- Ships in 2–4 business days
- 14-day limited returns
Description
Included and condition
Included
- Motorola SURFboard SB6121 Cable Modem
- Power adapter
- Ethernet cable
- Quick start guide
- Box not included for used items
Condition
- Graded New Open Box. Use the listing photos for final cosmetic review.
- No major extra issues are called out in the listing text beyond what is shown in the photos.
Confirm exact contents in the product photos. Accessories vary per unit.
Product overview
Get reliable high-speed internet connectivity with the Motorola SURFboard SB6121 DOCSIS 3.0 Cable Modem. This pre-owned modem is in 'New Open Box' condition, ensuring you receive a quality product at a fraction of the retail price. With download speeds of up to 172 Mbps and upload speeds of 131 Mbps, it's designed for smooth streaming, gaming, and downloads. The modem features 4-channel bonding for stable connections even during peak hours, making it compatible with major U.S. cable providers. Enjoy peace of mind with our 14-day return policy and secure checkout.
Key features
- New Open Box condition
- Up to 172 Mbps download speed
- 131 Mbps upload speed
- 4-channel bonding for stability
- Compatible with major U.S. cable providers
- Ideal for streaming and gaming
Why buy on TamDo.us
Buying pre-owned electronics on TamDo.us means lower prices than retail without sacrificing quality. We photograph each item in our Utah warehouse so you see exactly what you're buying — not stock images. Orders ship within 2–4 business days with tracking, and we offer 14-day returns on material defects. Need to inspect in person? Visit our local store at TamDous.com.
Good to know before you buy
Still unsure? Text (385) 715-6888 with SKU 23792What is the condition of the modem?
The Motorola SURFboard SB6121 is in 'New Open Box' condition.
How fast is the internet speed with this modem?
It offers up to 172 Mbps download and 131 Mbps upload speeds.
Is this modem compatible with my cable provider?
Yes, it is compatible with major U.S. cable providers.
What is the return policy?
We offer a 14-day return policy for your peace of mind.
How long does shipping take?
This item ships from Utah within 2–4 business days.
What payment methods are accepted?
We provide a secure checkout process with various payment options.
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