Introducing an updated version of OH1 from the pioneer Polar heart rate monitor. The main feature of the OH1+ is that it is compatible with existing Bluetooth, as well as ANT+. It also comes with a clip to attach the OH1+ to your goggles for easy swimming use. By using the clip, the OH1+ adheres to the temple, allowing you to measure your heart rate accuracy.
Equipped with 6 LEDs, the optical heart rate sensor weighs approximately 0.6 oz (5 g) and is lightweight with the armband, so it wont hinder your exercise when you wear it. In addition, when you are training, you can easily measure your heart rate without having to hold any other device or smartphone. The OH1+ is attached to the arm, eliminating the hassle associated with the chest strap and reduces motion artifacts. This heart rate sensor has a close accuracy to the chest strap.

From the Manufacturer

	Polar OH1+	Polar Verity Sense	Polar H10
Heart Rate Measurement	Optical Sensor (6LED)	Optical Sensor (6LED)	Cardio
Where to Wear	Arm or temple	Arm or temple	Chest circumference
Battery life	12 hours (rechargeable)	30 hours (rechargeable)	400 hours (battery powered)
Battery charge	○	○	x (battery replaceable)
Built-in Memory	200 hours	600 hours	1 training load.
Compatible with ANT+ and Bluetooth Low Energy	○	○	○
Connects simultaneously with Bluetooth Low Energy	2	2	2
Compatible with 5 kHz training equipment	x	x	○
Waterproof performance	30m	50m	30m
Recommendation Level	Beginner to Intermediate	Intermediate to Advanced	Advanced to professional athletes.