Detail: Bike Power meters have been around since the nineteen-nineties. In the last few years, however, they have moved from being pro-only equipment to affordable training aids for amateur racers and keen recreational riders. When used properly, a power meter can provide you with really useful information that can vastly improve your training and pacing. It helps you to become more of a professional rider. Although Power meters have been developed over many years, reliable models have remained pro-only equipment for high level riders, the elevated selling prices aimed firmly at that market. This is why many mid or entry level cyclists have found it difficult to justify such an outlay. Therefore Ronde set out to develop a reasonably priced power meter which has competitive function accuracy comparable with the famous brands (Shimano, Powertap, etc.). Ronde Power Meter is a crank based power meter. It is easy to install and it essentially contains a series of strain gauges that measure the magnitude of the force applied by the rider. Then the accelerometer detects the movement frequency of the rider (such as cadence), this data is transmitted to the GPS device for rider review. Data transmission is through ANT+ wireless technology which is very common on bike GPS devices, and is easy to pair with. Compatible Devices: f?nix 2 Special Edition D2 Bravo Edge 1000 Edge 25 Edge 500 Edge 510 Edge 520 Edge 800 Edge 810 Edge 820 Edge Explore 1000 Edge Explore 820 epix eTrex Touch 35 eTrex Touch 35t fenix 2 fenix 3 f?nix 3 HR f?nix 3 Sapphire f?nix Chronos Forerunner 230 Forerunner 235 Forerunner 310XT Forerunner 35 Forerunner 630 Forerunner 735XT Forerunner 910XT Forerunner 920XT Oregon 700 Oregon 750 Oregon 750t tactix Bravo Varia Vision In-sight Display VIRB Ultra 30 VIRB X VIRB XE vívoactive vívoactive HR ** Update firmware version by Bluetooth.. Product Spec: Data Connection: ANT+ Accuracy: +/- 3% Battery: CR2032 Battery Life: 150 hrs Weight: 11g Stand by Time: ~ 1 Year Operating Temperature: -10~50? Water Rating: IP66 Include: RONDE Power Meter Sensor x 1pc with Installation Service (Installation + Return Shipping after Installed Power Meter Sensor) *** Buyer need to Send his/her own crank arm to us for installation under his/her Expenses We do provide US / UK / Germany / France / AU / Korea / Japan / Taiwan address for Customers to send his own crank arm to us for installation (process in Hong Kong). SKU: CL-0073_onlysensor 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. 30-Day Money Back. No question ask. Need return item Contact us anytime 24/7 and I will get back to you within 24 Hours. Experienced in home garden product. Assist heaps of local retails sourcing Well customer service and quick reply your questions within 24hrs Don't hesitate to contact us at anytime via message Please don't left a negative feedback easily without any notices, it solve nothing. Please trust us and will definetly do your favor! Also welcome wholesale and customizes service Fast Worldwide Shipping! All orders are shipped within 48 Hours of your cleared Payment Please select a best shipping options for yourself when check out See here: - Economy :10~21 day - Standard :10~21 day W. tracking - Expedited : 3~7 day Full Tracking