INPEAK GRX RX820 Rechargeable Power Meter Crank Arm The INPEAK GRX RX820 Rechargeable Power Meter Crank Arm is the latest evolution of the INPEAK power meter range, created with modern performance needs in mind. Using the proven POWERCRANK E measuring system, it introduces a rechargeable battery that is easily powered via the included magnetic USB cable. More than a measurement tool, it supports riders in reaching a higher level of training and performance. INPEAK Advanced Connectivity The POWERCRANK E system uses both ANT plus and BLE transmission protocols to deliver power, cadence and a wide range of detailed cycling performance metrics to compatible devices. Purpose built for road and gravel bikes, the low profile housing is waterproof and highly durable, ensuring reliability in varied riding environments. INPEAK Consistent Accuracy Precision is maintained in all conditions thanks to ATC automatic temperature compensation, which keeps readings accurate from minus five to fifty degrees Celsius. The rechargeable system provides an efficient, modern solution for riders looking for dependable and repeatable power data. In The Box Crank with integrated power meter USB charging cable Instruction manual Sticker set Device data card