This chest strap is designed for monitoring your heart rate.
Feature: Accurate heart rate monitoring helps you to achieve the best exercise state. Supports multi-sport modes and records exercise time, distance, calories burned automatically. Large capacity and low power consumption battery support 100 hours normal use after a full charge. Compatible with most apps, all data can be transmitted to mobile training Apps through BT. Breathable rubber strap with an adjustable elastic band, easy and comfortable to wear. IP68 waterproof allows you to enjoy running even in the rain. A great choice for rowing, cycling, climbing, yoga, running, training indoors or outdoors.
Specification: Material: ABS + Nylon + Spandex. Color: Black. Battery Capacity: 150 mAh Charging Time: 2 - 6 hours BT version: BT 4.0 Waterproof: IP68 Strap length: 60 - 90 cm / 23.6 -35.4 in Strap width: 3 cm / 1.2 in Strap Weight: 31 g / 1.1 oz Monitor Size: 6.2 * 3.6 * 1 cm / 2.4 * 1.4 * 0.4 in Monitor Weight: 15 g / 0.5 oz Minimum wearing size: 60 cm / 23.4 in Maximum wearing size: 150 cm / 59.1 in Package size: 11 * 11 * 3.5 cm / 4.3 * 4.3 * 1.4 in Package weight: 137 g / 4.8 oz