***Right Crank arm is not included*** Detail: Bike Power meter has been originated in the nineties of last century. In just a few years, power meters have moved from being pro-only equipment to affordable training aids for amateur racers and keen recreational riders. When used properly, a power meter gives you potent information that can vastly improve your training and pacing. It helps you be a professional rider. Although the Power meter has been develop for a few years. But it is still a reliable pro-only equipment for the high level riders, so the selling price also at a high level price. It is the reason that makes many mid or entry level user step back. Therefore Ronde aims to develop a reasonable price power meter which has competitive function accuracy with the famous brand (Shimano, Powertap, etc.). Ronde Power Meter is a crank based power meter. It is easy to install and it is essentially contains a series of tensiometers/sensors that measuring the magnitude of the force applied by the rider. Then through the accelerometer to detect the movement frequency of the rider (such as cadence), and then transmitted the data to the GPS device for rider review. Data transmit through ANT+ wireless technology which is very common on nowadays bike GPS device, and easy to pair with. Compatible Devices: Most of the Garmin Device which is compatible with Ant+ ** Update firmware version by Bluetooth.. Product Spec: Data Connection: ANT+ Accuracy: +/- 3% Battery: Rechargeable Battery Included Battery Life: 150 hrs Weight: 11g Stand by Time: ~ 1 Year Operating Temperature: -10~50? Water Rating: IP66 Include: Shimano R8000 Right Crank with Xcadey Power Meter x 1 SKU: CL-0073_R8000-R International delivery - items may be subject to customs processing depending on the item's declared value. Sellers set the item's declared value and must comply with customs declaration laws. As the buyer, you should be aware of possible: - delays from customs inspection. - import duties and taxes which buyers must pay. - brokerage fees payable at the point of delivery. Your country's customs office can offer more details, or visit's page on international trade.