Polar OH1 optical heart rate sensor

Polar OH1 + Waterproof Optical Heart Rate Monitor with Swimming Goggle Strap Clip and Armband – HR Monitor with Bluetooth, ANT+. Wear Polar HR monitor either on your arm when rowing, cycling, running or training indoors, or against your temple when swimming.

Specifications:

• Battery capacity: 45 mAh
• Up to 12h Battery Life (USB Rechargeable)
• Interfaces: ANT+, Bluetooth
• Size: Ø 29.8 mm
• Adjusting the length of the bracelet/strap
• Bracelet/Strap Material: Polyester
• Waterproof class: WR30
• Heart rate sensor
• Heart rate monitor
• 6-LED Optical HR Technology
• 4MB Storage / 200h Internal Memory
• Up to 75m Broadcast Range