Made of rugged materials, the blood oxygen meter is waterproof, shockproof, and has a lanyard loophole for portability. Bring it outdoors while you are cycling, jogging, running, mountain climbing, or doing any sports activity to monitor your vitals. This device will ensure you are not pushing yourself to the limit. Like you, this device is tough. It has a long battery life and an automatic power off after 8 seconds of non-use.