ST-256-S1 – Imou 256GB MicroSDXC Surveillance Card Class 10 U3 V30

Product Overview

The Imou ST-256-S1 256GB MicroSDXC Surveillance Card represents the maximum edge storage tier within the Imou ST series, engineered specifically for high-capacity continuous 24/7 video surveillance, multi-week local archiving, and ultra-high-resolution edge recording. Designed to handle continuous, intensive write cycles in modern IP camera installations, this flash card delivers smooth, dropped-frame-free performance in high-resolution 2K (4MP/5MP), 3K, and 4K Ultra HD smart security cameras and CCTV systems.

Purpose-built for surveillance workloads and fully compatible with all major IP camera brands that accept microSD storage, the ST-256-S1 is ideal for homeowners, commercial retail establishments, and enterprise perimeter installations that require extensive standalone on-camera footage retention without mandatory cloud subscriptions or localized NVR drives. Meeting Class 10, UHS-I (U3), and Video Speed Class 30 (V30) standards with read speeds up to 95 MB/s and write speeds up to 40 MB/s, it enables swift video playback scrubbing, rapid footage exports, and long-term write endurance.

✅ Key Features

• Capacity: 256 GB — MicroSDXC format.

• Speed Class: Speed Class 10, UHS-I Speed Class 3 (U3), Video Speed Class 30 (V30) — read speeds up to 95 MB/s, write speeds up to 40 MB/s.

• Surveillance-Grade Endurance: Purpose-built for continuous 24/7 write cycles and continuous overwrite loops.

• 4K UHD & High-Bitrate Capture: Sustained throughput optimized for high-efficiency compression codecs (H.265 / H.264 / Smart Codecs).

• Loop Recording Compatible: Seamlessly auto-overwrites the oldest video footage when storage capacity is exhausted.

• Low Power Consumption: Highly efficient power draw, suitable for battery-operated, cellular 4G, and solar-powered perimeter cameras.

• Industrial 4-Proof Durability: Waterproof, shock-resistant, anti-magnetic, airport X-ray proof, and temperature resistant.

• Maximum Standalone Retention: Delivers the longest standalone video archive in the Imou surveillance lineup.

📸 Compatible Devices

• Imou Smart Security Cameras (Cruiser, Ranger, Bullet, Cue, Rex series)

• Universal IP Security Cameras with MicroSDXC slots (Bullet, Turret, Dome, PTZ)

• Video Intercoms, SIP Video Door Phones, and Smart Video Doorbells

• Vehicle Dashcams and Mobile Surveillance Recorders (MDVR)

• Smart home automation hubs, baby monitors, and pet cameras

🕐 Approximate Recording Capacity at 256GB

• 720p @ 15fps: ~40–56 days of continuous recording

• 1080p @ 15fps: ~28–36 days of continuous recording

• 1080p @ 25fps: ~16–24 days of continuous recording

• 2K / 4MP @ 15fps: ~12–20 days of continuous recording

• 4K UHD @ 15fps: ~7–10 days of continuous recording

• Motion Detection Mode: Up to 2–4× longer retention compared to continuous recording

Note: Actual recording time varies based on camera compression algorithms (H.264 / H.265 / Smart Codecs), bitrate parameters, frame rates, motion detection sensitivity, and scene complexity. Enabling motion-triggered recording significantly extends local video retention.