Digicue was sold as an OB brand, but this product is from after OB went out of business, and the rubber part attached to the butt end does not have the OB logo. I purchased this new from an overseas e-commerce site. In addition to shipping and consumption tax, I incurred fees for currency hedging. As shown in the photo, the package design has also been changed, and the cylindrical case has become compact and convenient to carry. The old Digi-Q only detected stroke deviation and notified with vibration, but from Digi-Q Blue onwards, there are dedicated apps for iOS and Android respectively (English version only). By connecting via Bluetooth, not only the up/down and left/right of the cue's trajectory, but also the "back damage" and "remaining heart" time are scored. Above all, in the FLT (Follow Through) section, the acceleration of the cue after impact can be measured, allowing you to recognize the subtle difference in touch between the tap and the ball. For more details, please search for DigicueBlue on YouTube and check the instructions, including how to use it. youtu.be/wP9M_fZPNeE ※This product comes with instructions, but only the minimum information is written in English. English can be read in real-time translation with Google Lens. In terms of usability, it's an excellent training item for billiards. I improved my follow-through from about 3 to around 6-7 (Image 6). This effect improves ball retention, makes shot speed easier to control, and stabilizes the leading ball. If the cue speed is too fast, the measured value will drop (low scores are displayed in red), so I don't think it can be used to measure the effect of a break shot. Depending on the settings, you can change the leniency of the judgment, and digi cue BLUE can vibrate not only on failure but also on success. However, the battery drains very quickly. The battery (CR2032) was replaced twice after purchase. Rather than worrying about your stroke or using a swing-only stroke trainer, we recommend practicing with DIGICUE's training for a short period to quantify and review results without relying on feel. Since this is a rare item, it is unlikely to lose value in resale. When you get better, let's pass it on to another player. Addendum) Caps for snooker cues are unused