Wireless surface EMG

Dynamic analysis of muscle activity and biofeedback in any environment

FREEEMG is a wireless device for surface electromyography (EMG) analysis. Signal accuracy, the absence of wires, the lightness and reduced size of the probes are features enabling users to assess any type of movement, for each body part, without altering the natural movement of the person being tested.

Thousands of centres worldwide use our EMG device in various fields such as: research, sports, occupational medicine, gnathology, neurology and orthopaedics.
FREEEMG is a single system used for multiple purposes: from monitoring to diagnostics and up to injury prevention.

The system is provided with a large variety of predefined analysis protocols allow for muscle activity assessment during specific exercises.

The software analyses the collected information and automatically generates graphical results allowing for immediate comparison with normal ranges.

Technical highlights


Up to 20

Battery life

of continuous acquisition

Ultralight probes

13 g

Why choose it

Excellent performance

Excellent performance

Thanks to our wireless miniaturized probes, even the weakest signals will be detected and accurately captured. Each probe is equipped with internal memory to ensure uninterrupted recording in case of temporary connection loss and to allow for acquisitions in wide spaces and open fields.
Practical and effective

Practical and effective

Preparing the subject for testing has never been so quick: the probes are directly attached to the pre-gelled electrodes, with no need for additional fastening. The complete absence of wires reduces not only patient distress during preparation but also grants them full range of motion during tests, without any restriction.
H2O version available

H2O version available

FREEEMG H2O is specially designed for water measurement. Thanks to a special protective gel, the probes are completely waterproof and can be immersed in water up to a depth of 3 meters (IP68 classification). The muscle activity evaluation in water can be carried out for both rehabilitative purposes and in sports contexts.
Integration with the BTS inertial sensor

Integration with the BTS inertial sensor

Thanks to the integration of the G-SENSOR, FREEEMG makes it possible to carry out a dynamic functional assessment of the activation status of specific muscle chains. Discover more about our Functional protocols packages on the FREELAB page.
Does not require dedicated spaces

Does not require dedicated spaces

The system can be installed on any Windows laptop and is completely wireless. It does not require a dedicated space but can be used in the lab as well as in open spaces. The system is supplied with a carry case for easy portability.
Excellent performance
Practical and effective
H2O version available
Integration with the BTS inertial sensor
Does not require dedicated spaces

EMG Analysis has never been so quick and easy

Based entirely on wireless technologies, BTS FREEEMG uses up to 20 variable geometry probes for the acquisition and transmission of EMG signals. It also manages probes for the connection of electrogoniometers, allowing the assessment of angles, angular velocities, angular accelerations and footswitches for foot-floor contact area detection. All the probes are easy and quick to recharge by clipping them onto the proprietary probe charger.

Main Features
Technical features
  • Up to 20 probes, selectable among EMG, electrogoniometers and footswitch
  • More than 6 hours of non-stop acquisition
  • Easy and quick to recharge by clipping onto the proprietary probe charger
  • Active and variable geometry electrodes
  • Record of miniaturization weighing only 13 grams.
  • On-board solid-state buffer memory to secure data in case of any WiFi signal loss
  • Up to 20 meters for the data transfer between the probes and the workstation
  • Native integration with BTS motion caputre systems, inertial sensors, force platforms, video cameras.
  • Integration with third-party systems
  • Software for clinical assessment and performance analysis
  • Object-oriented software for the development of customised protocols
  • Development tools

Wireless Probes

Surface electrodes Variable geometry electrodes with snap connectors – 16-bit resolution – acquisition frequency 1KHz
Data transmission Wireless IEEE802.15.4 data transmission (probes – USB receiver) – Real Time
Battery Rechargeable with proprietary charger (snap connector) – lithium-ion polymer
Autonomy Over 6 hours of continuous acquisition
Acquisition range Up to 20 meters (65 feet) in free space (without obstacles)
Holter The solid-state memory allows data storage up to 1 hour and 40 minutes for systems with less than 6 EMG probes, and up to 2 hours for systems with more than 6 EMG probes
Memory On board solid-state buffer memory system
Weight 13 grams (battery included)
Size 41,5×24,8x14mm mother electrode – Ø 16x12mm satellite electrode
Certification Class “IIa”

USB Receiver

EMG channels Up to 10 wireless probes each receiver (no more of 2 receivers allowed)
Weight and size 80 grams – 82x44x22,5mm

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