Leading ankle monitor manufacturer serving corrections, pretrial, parole & probation agencies in 30+ countries. One-piece GPS ankle monitors with 7-day battery, fiber optic anti-tamper (zero false positives), and <3 second installation.
Next-generation GPS ankle monitors and electronic ankle bracelets. Ultra-high security and reliability powered by 20 years of innovation in electronic monitoring technology.
The lightest one-piece GPS ankle monitor at 108g. 7-day battery, fiber optic anti-tamper (zero false positives), multi-GNSS positioning under 2m accuracy.
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Two-piece GPS ankle bracelet and tracking unit for precision location monitoring. RF wristband pairs with portable tracker for continuous offender supervision.
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Advanced curfew monitoring with integrated cellular and Bluetooth, plus battery backup for continuous operation.
Learn Morebluetooth optical fiber wristband
The smallest professional electronic monitoring anti-tamper wristband in the world — only 17g, virtually indistinguishable from a fitness band.
BLE and RF ankle bracelet options with 2-year battery life. Fiber optic tamper detection for GPS ankle monitor pairing with i-Tracker or HouseStation.
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CJIS-READY MONITORING PLATFORM
A CJIS-ready, zero-trust platform with court-admissible evidence reports, 13 modules for GPS ankle monitor management, offender tracking, zone alerts, and compliance reporting. ECDSA-signed data chain from device to courtroom.
Learn MoreONE-STOP MONITORING SOLUTION
From high-risk GPS ankle monitors (CO-EYE ONE) to low-risk smartphone tracking (AMClient), our electronic monitoring product matrix covers every offender supervision need on a single unified platform.
expert guides
Expert resources to help you understand, evaluate, and deploy electronic ankle monitoring technology.
How ankle monitors work, types (GPS, RF, alcohol), who wears them, costs, rules, and the technology behind modern electronic monitoring.
Read the guide →How GPS ankle bracelets work, one-piece vs two-piece types, battery life, tamper detection, accuracy, costs, and procurement evaluation.
Read the guide →In-depth comparison of BI Incorporated, SCRAM, SuperCom, Geosatis, and CO-EYE capabilities and market positioning.
Compare vendors →Daily fees, equipment costs, total cost of ownership analysis, and state-by-state pricing comparison for EM programs.
See cost breakdown →Home detention technology, curfew enforcement, RF vs GPS monitoring, and compliance management for house arrest programs.
Read the guide →Complete overview of electronic monitoring: GPS, RF, alcohol, smartphone supervision. History, global programs, evidence, standards & procurement.
Read the guide →200,000+ devices deployed across 30+ countries. 7-day battery. Zero false tamper alerts. Under 3-second installation.
Get started today200,000+
Devices Deployed
30+
Countries Served
20+
Years of Experience
CJIS
Security Policy Ready
REFINE Technology (CO-EYE) has been a professional ankle monitor company since 2004, providing GPS ankle monitors and electronic monitoring solutions to government agencies, corrections departments, and bail bond companies worldwide.
Governments buy GPS ankle monitors for $1 to $5 per day. Then they charge individuals $5 to $40 per day for the same equipment. We analyzed fee data from all 50 states and uncovered a system where the cost of “alternative to incarceration” falls almost entirely on the people being monitored — creating what advocates […]
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Pretrial GPS monitoring has shifted from a niche alternative to mainstream judicial practice. In 2026, more than 14 US states have introduced or enacted legislation expanding pretrial electronic monitoring, the UK has made GPS tagging a presumptive condition for prison leavers, and Harris County, Texas invested $1.4 million specifically to strengthen its GPS ankle monitor […]
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On October 1, 2026, the United Kingdom launched what the Ministry of Justice calls “the toughest supervision in British history” — a sweeping overhaul of post-prison monitoring backed by £700 million in new funding. The centerpiece is a world-first “restriction zone” system that confines high-risk sexual and violent offenders to geographic areas as small as […]
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