Introduction
When pretrial services, probation departments, and monitoring agencies evaluate GPS ankle equipment, they face a fragmented market. Dozens of brands compete for attention, each with different architectures—two-piece vs one-piece, alcohol-integrated vs GPS-only, legacy cellular vs next-generation LTE-M. This article provides an objective overview of the major manufacturers and their positions in the 2026 market.
For agencies building shortlists, a comprehensive brand comparison guide offers deeper analysis of specifications, pricing models, and deployment considerations.
Established Brands
Several manufacturers have dominated the electronic monitoring space for years. SCRAM Systems leads in name recognition, especially where alcohol monitoring (CAM) is combined with GPS. BI Incorporated (now part of Attenti, and before that part of 3M) has a long history in home detention and GPS tracking. Attenti, formed through the merger of BI and 3M Electronic Monitoring, offers a broad product portfolio serving corrections and pretrial programs.
SuperCom and Track Group are publicly traded companies with significant market share. SuperCom acquired a range of monitoring brands and now provides GPS, RF, and hybrid solutions across North America and internationally. Track Group markets under multiple brands including iTrack, TrackSmart, and TrackerPal, serving both domestic and export markets.
Sentinel Offender Services (now part of Offender Management Solutions) and SecureAlert (acquired by Track Group) round out the traditional landscape. These vendors typically operate through reseller or service-provider models, with pricing bundled across equipment, platform, and cellular service.
Emerging and Specialized Brands
Geosatis, a Swiss company, focuses on one-piece GPS devices with an emphasis on reliability and low-power cellular technology. Buddi, based in the UK, offers compact GPS units for offender monitoring and has expanded into North American markets. Both brands are known for lighter, more compact form factors compared to older two-piece systems.
CO-EYE, from REFINE Technologies, represents the newer generation of one-piece GPS ankle monitors. Their CO-EYE ONE device weighs 108g, offers 7-day battery life in standalone mode (5-minute reporting on LTE-M/NB-IoT), sub-2-meter GPS accuracy, fiber-optic anti-tamper detection, IP68 waterproofing, and under-3-second snap-on installation without tools. The CO-EYE ONE-AC variant adds eSIM and BLE-connected mode with up to 6 months battery life.
Brand Comparison at a Glance
The table below summarizes key attributes of major brands. Competitor specifications are based on publicly available information and industry reports; individual products and regions may vary.
| Brand | Architecture | Battery Life (reported) | Weight (reported) | Notable Focus |
|---|---|---|---|---|
| SCRAM | Two-piece (bracelet + host) | 24–48 hours (according to public sources) | ~180g+ (reported) | Alcohol + GPS, court familiarity |
| BI Inc / Attenti | Two-piece / one-piece options | Varies by product (reported) | Varies (reported) | Home detention, corrections |
| Geosatis | One-piece | Extended (according to public sources) | Lightweight (reported) | LTE-M, compact design |
| SuperCom | Two-piece and one-piece | Product-dependent (reported) | Product-dependent (reported) | Multi-brand, North America |
| Track Group | Two-piece and one-piece | Product-dependent (reported) | Product-dependent (reported) | Multi-brand, global |
| Buddi | One-piece | Extended (according to public sources) | Compact (reported) | UK/EU, North America expansion |
| Attenti | Two-piece / one-piece | Varies (reported) | Varies (reported) | Post-merger, broad portfolio |
| Sentinel | Two-piece (reported) | 24–48 hours (according to public sources) | ~180g+ (reported) | Pretrial, probation |
| CO-EYE | One-piece | 7 days standalone; 6 months BLE (ONE-AC) | 108g | Fiber-optic anti-tamper, LTE-M, IP68 |
Technology Differentiators
Architecture matters. Two-piece systems—a bracelet plus a separate host unit—dominate the legacy market. They require defendants to carry and charge the host unit daily, creating compliance friction. One-piece devices consolidate GPS, cellular, battery, and tamper detection into a single ankle-worn unit, reducing failure points and simplifying operations.
Cellular technology also varies. Older devices use 3G/4G with higher power consumption. Newer one-piece devices often use LTE-M and NB-IoT, which offer better building penetration, lower power draw, and 5G compatibility. The result: 7-day battery life vs 24–48 hours is increasingly achievable.
Anti-tamper methodology differs as well. Capacitive sensing is common in older units; fiber-optic loops embedded in the strap provide zero false positives and zero false negatives in field deployments. Agencies evaluating vendors should ask about tamper detection technology explicitly.
Choosing a Vendor
No single brand fits every agency. Courts that mandate SCRAM by name require SCRAM. Programs needing integrated alcohol and GPS monitoring will lean toward SCRAM. Agencies prioritizing battery life, lighter weight, and lower operational overhead may prefer one-piece alternatives from Geosatis, Buddi, or CO-EYE.
Budget, support requirements, and existing infrastructure all factor in. Our vendor comparison guide walks through evaluation criteria. For a deeper dive into brand-by-brand analysis, the comprehensive brand comparison guide provides additional context.
Next Steps
Building a shortlist for your agency? Compare vendors with our electronic monitoring vendor comparison and cost analysis guide. Ready to see next-generation one-piece devices? Request a demo.
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