There still aren’t many fitness trackers that are suitable for a gym atmosphere. While devices like the Atlas Wristband have pushed the category forward, the Fitbits and Garmins of the world still mostly focus on cardio exercises while throwing a few trackable moves like “weight training” into the mix. The $250 Beast Sensor is one of the newest devices to target gym-goers, specifically weight-room junkies.

The Sensor is a small module that, when attached to your wrist, back, or gym equipment, measures speed, power, and a number of other atypical metrics to help you achieve beast-like fitness goals. The Beast Sensor is built on the principles of velocity-based training, which is a way of working out that only a select group will be able to use (and want to use) to their benefit. I spent some time with the Beast Sensor in my gym and can say it’s a capable fitness tracker, but only certain people will find it invaluable.

Design: Little sensor, lots of power

Despite its pseudo-intimidating name, the Beast Sensor is diminutive. It’s a two-inch long neon yellow module that holds three accelerometers, three gyroscopes, and three compasses, with a lithium ion battery inside. The Sensor has the company’s logo in black, and a small indicator light flashes when the sensor is properly connected to your smartphone via Bluetooth. The indicator also flashes when the Sensor charges via its microUSB port. On top of everything the Sensor packs into its tiny module, it’s also magnetic, so you can attach it to its included wristband and any gym equipment you want, including barbells and metal weight machines.