Samsung MB MJ256K 256 GB MicroSDXC UHS I Class 10

Amazon

Up to 140,160 hours of 4K and Full HD (1080p) recording and playback with capacities up to 256GB Up to 100MB/s read and 40MB/s write speeds with class 10 and U3 compatibility. Performance varies by capacity. Designed specifically for video monitoring cameras (dash cams, surveillance & security cams, CCTV, body cams, etc.) Reliability built to last: Waterproof, Drop proof, Temperature proof, X-ray proof, Magnet proof, Wearout proof Secures data with a limited warranty up to 5 years. Warranty varies by capacity

Currys

Good to know- This Pro Endurance card is designed for always-on recording - great for CCTV, dash cams, and body cams- Built to last for a marathon 140K hours of loop recordings, you can simply leave it to do its thing- It can handle beefy 4K and Full HD video files thanks to read speeds up to 100 MB/s and write speeds of up to 40 MB/s- This card is made to last - it can withstand water, drops, magnets, X-rays and temperature swings- Because most PCs only have an SD card reader, it comes with an SD adapter