Arris SURFboard SB6121 Cable Modem (SB6121) - $20 (Iowa City & Coralville)

I used this for Mediacom Internet 60 (now it is Internet 100) and saved a lot because I didn’t have to pay for a modem rental fee.
It is like new condition, it worked fine.
Selling this because of service upgrade.
NOTE: It is not WiFi router.
This is cable modem.
You will need WiFi router if you want to use WiFi.
Brand: ARRIS Internet service provider: spectrum, optimum, cox, xfinity Connectivity Technology: Wired Product Dimensions: 6.
4"L x 2"W x 8.
7"H Color: Black Number of Ports: 4 Maximum Downstream Data Transfer Rate: 172 Megabits Per Second Maximum Upstream Data Transfer Rate: 132 Megabits Per Second Data Transfer Rate: 160 Megabits Per Second Modem Type Cable - Compatible with Time Warner Cable, Charter, Cox, Cablevision, and more - Not compatible with Verizon FiOS or AT&T U-verse, no longer approved by Comcast Xfinity - Requires Cable Internet Service, if not sure your provider is CABLE call them to confirm - Wired modem only, does NOT include WIFI Router or VOIP Telephone adapter.
- Gigabit Ethernet port to connect to computer or Router for fast downloads.
- Internet speeds based on your Cable providers service - up to 172 Mbps download and 131 Mbps upload.
4 Download and 4 Upload Channels.