Sunlight-Readable 2.6" color display Expanded Internal Memory 4GB. DUAL BATTERY SYSTEM Use with 2 traditional AA batteries, or the optional rechargeable NiMH battery pack that can be charged while inside the device.Weight 8.1 oz (230 g) with batteries Get Smart Notifications. Pair with optional ANT+ sensors, such as heart rate monitor, speed/cadence, or use to control your VIRB action camera (64s/64st only).Wirelessly upload data to Garmin Connect and view on smartphone. Display size(inches):1.43 x 2.15