• Overview
  • Technical specs

One-Piece Tracking Device 4 (TD4)

A self-contained GPS tracking device designed to continuously monitor the offender's location at varying levels of intensity. The One-Piece Tracking Device 4 (TD4) offers robust integration of location tracking, communication technologies and anti-tamper mechanisms to provide a reliable tracking solution.

Trusted Offender Monitoring

We pioneered the offender tracking industry by being the first company to integrate GPS, RF, and cellular communications into a comprehensive offender tracking solution. With the largest global presence in the industry, Attenti now tracks more than 60,000 offenders in over 34 countries.

Advanced Communication

Providing multiple options for unique agency needs. Attenti offers multiple CDMA and GSM cellular networks and tower-based tracking to provide the most reliable coverage nationwide. The TD4 also incorporates two-way communication to encourage offender compliance.

Size & Weight

Height 3.72 inches
Width 3.30 inches
Depth 1.82 inches
Weight <6.5 ounces


Simple Enrollment and Installation

Custom program configuration allows specific rules, schedules, and zones to be set for each participant. Quick and simple installation provides a custom secure fit for each participant. Activates in less than 5 minutes.

Onboard Processing

The TD4 stores the participant’s rules onboard and compares its location to the rules defined for the participant. By doing so, the device can notify participants and generate alerts for noncompliance faster than devices that do not have this capability.

Pursuit Mode

Pursuit Mode enables the Attenti system to go into real-time tracking. It accelerates the speed at which the TD4 reports into EM Manager, allowing officers to closely track the offender’s locations during an active investigation.

Optional Indoor Beacon

Effective home curfew monitoring improves location accuracy while allowing offenders to move freely indoors.

Patented Strap Design

Attenti has patented a light-focusing technology that maximizes our ability to detect strap tampers. The strap contains an accurate fiber optic circuit and an internal copper wire aids in stretch resistance and durability.

Supporting Software

Attenti’s Electronic Monitoring Management Software, EM Manager, provides integrated monitoring, mapping and tracking, case management, reporting, and inventory management. The Mobile EM Manager app, available in the Apple and Android Stores, allows users to perform essential GPS monitoring functions while in the field.