Product Details + "AN INGENIOUS SOLUTION TO LAYERING IN CHILLY TRANSITIONAL WEATHER." — MATT, NC Carbon-Z4 Heating System Runtime 10 hours - low 6 hour - med 3 hour - high Heating Panels right chest left chest neck back Control Type 10 in-app settings 3 on-board settings Integrated with HeatSync™ Control your heated apparel remotely featuring Exclusive Bluetooth App On-Board Manual Button Controls notes from our lab Combine a weather resistant puffy vest with high-end heating performance for a versatile mid-layer wearable alone or under a jacket Ultralight Battery 5000 mAh capacity now 40% smaller and lighter engineered ultracompact lithium-ion cells UL Certified / TSA Approved