Polar OH1Scosche RHYTHM24Scosche RHYTHM+Wahoo Tickr Fit
TECH SPECS 
SizeElastic strap Worn on the upper or lower arm. Adjustable straps. One size fits all.Worn on the upper or lower arm. Adjustable straps. One size fits all.Elastic strap fits on the forearm. It comes with 2 adjustable bands, the smaller measures 260mm long while the longer of the two is 375mm.
ChargingYesUSBUSBYes, USB
Battery45 mAh Li-pol rechargeable batteryLithiumLithiumLi-pol rechargeable battery
Battery lifeUp to 12 hours of continuous trainingup to 24 hoursup to 8 hoursUp to 30 hours
Water resistanceup to 30 mIP68 (can be submerged up to 1 meter)IP67 (sweatproof)IPX7 water resistant
WeightSensor 5 grams, strap 12 grams22 grams19 grams
SensorHeart rate sensorValencell optical heart rate sensor, NFC A-TagHeart rate sensorHeart rate sensor
ConnectivityBluetooth Bluetooth (100 ft range), dual-mode radio that can simultaneously transmit your heart rate to multiple ANT+ displaysBluetooth (100 ft range)Bluetooth and ANT+ capabilities
Internal storageUp to 200 hours trainingYesNo
METRICS 
Heart rateYesYesYesYes
Heart rate variabilityYesNo
Running metricsKeeps track of your heart rate with multiple target zones, calories burned, steps taken and distance.Real-time heart rate data, run pace, run cadence, Real-time heart rate data.
Swim statisticsSuitable for bathing and swimmingNoNo
Other- Works with many fitness apps.
- LED’s can also be used to show HR zones
- five training modes and two multi-modes to choose from
- heart rate variability (HRV) mode that monitors the time between each heartbeat for stress and recovery tracking
Works with many fitness apps.Calorie tracking
LINKS 
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