Equipment specifications.

Every device we deploy is court-validated, manufactured by established providers in the electronic monitoring industry, and selected for the standards Maryland courts and supervising agencies require. Below is what we deploy, what it measures, and the manufacturer documentation for each.

Refer a Client

Sentry partners with Sentinel Offender Services, a community corrections technology provider serving North American agencies since 1993. The hardware below is manufactured to court-validated standards. The case management software runs on Sentinel's DNA platform. Detailed manufacturer documentation is linked under each device.

GPS LOCATION MONITORING · MANUFACTURED BY SIERRA WIRELESS / OMNILINK

Omnilink OM500

One-piece electronic monitoring ankle device with GPS, Wi-Fi, and cellular tracking

The OM500 is the device most participants on the program wear. It tracks location continuously using GPS plus Wi-Fi positioning and cellular triangulation, so it works indoors and in GPS-impaired environments — not just outdoors. Two-way audio communication lets us reach the participant directly when needed.

  • Multi-signal precision tracking. GPS plus Wi-Fi positioning plus Verizon and AT&T LTE.

  • Tamper detection. Fiber optic strap and backplate sensors. Cut-free strap reduces false alerts.

  • Waterproof. IP68 and IP69K rated. Fully submersible.

  • Extended battery. 5+ days per charge. 30-minute rapid charge daily.

  • Two-way communication. Tone, vibration, and voice messages in multiple languages.

  • NIJ Emergency Removal compliant. Hypoallergenic, SAR compliant, no sharp edges.

For the court: The device transmits in real time over LTE. Location logs, schedule compliance, and tamper events are available to supervising authorities through Sentinel's DNA platform.

OM500 OVERVIEW
OM500 Spec Sheet 
CONTINUOUS ALCOHOL MONITORING · MANUFACTURED BY SCRAM SYSTEMS

SCRAMx Transdermal

Continuous transdermal alcohol monitoring bracelet with RF base station

SCRAMx is the only scientifically proven, court-validated continuous transdermal alcohol monitoring device available. It tests for alcohol every 30 minutes, 24 hours a day, by measuring transdermal alcohol — alcohol that diffuses through the skin as the body metabolizes it. Used by over 100,000 participants across the US.

  • Tests every 30 minutes, around the clock. Participants cannot miss or postpone a test.

  • No secondary confirmation required. The only continuous alcohol monitor that does not need a second test to confirm a drinking event.

  • Multiple tamper sensors. Best-in-class detection of obstruction attempts and removal.

  • RF base station. Communicates via landline, cellular, or Ethernet.

  • Court-validated nationally. Standard in DUI courts, drug courts, alcohol-restricted release.

  • Allows life to continue. Participants keep working and meeting family obligations.

SCRAMx Spec Sheet 
MONITORING INFRASTRUCTURE

The systems behind the devices

Every device feeds into a single case management platform monitored 24/7 by our staff.

CASE MANAGEMENT PLATFORM

SentinelDNA

Sentry uses an client management platform that provides single-screen access to GPS tracking, alcohol monitoring, drug testing, and case management. The system supports customized dashboards, real-time alerts, and advanced analytics to help Sentry monitor clients accurately and efficiently.

  • Real-time location and compliance dashboards

  • Court orders, financial obligations, and drug testing tracked in a single case file

  • Real-time alerts for technical and non-technical violations

SentinelDNA Spec Sheet