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INspider has rechargeable battery with coated electronics and strong sealing for water resistance to measure power from inside the spider. It samples combined left-right data to precisely record power output, cadence, TORQUE 360, Optimum Chainring Angle (OCA) & a recommendation of Optimal Chainring Position (OCP). Weight: 156g Material: 100% CNC-machined, 7075 aluminum alloy Battery Specifications: Rechargeable lithium-ion polymer + UBS cable Estimated Battery Life: 200 hours riding time Head Unit: ANT+™, Bluetooth® Smart; compatible ANT+™ head units: http://www.thisisant.com/directory Wireless Technology: ANT+™ 2.4 Ghz/ Bluetooth® Smart Data Transmitted: Power, cadence, balance via standard ANT+™ protocol and Bluetooth® Smart. Combined pedal analysis using Optimum Chainring Angle (OCA) and TORQUE 360 metrics in the User Software environment and the ROTOR Power app for smartphones Strain Gauges: 4 pairs Measurement Type: Both legs Axle Width: 24mm, 30 mm Water Resistance: IPX7 Software: ROTOR 2INpower app, ROTOR 2INpower User Software Analysis Software: Trainingpeaks.com/ROTOR Compatibility: RINGS: 110BCD x 4 arms rings. Q-RINGS® Oval rings & Round rings. CRANKS: ALDHU, VEGAST, ALDHU 24, RHAWK, RRAPTOR, KAPIC, KAPIC CARBON Discipline: Cyclocross, MTB, Road, TriathlonSHORT DESCRIPTION