Micro Personal Safety Beacon
Here is a wearable gadget that you can put on your belt to communicate with others with visibility up to 1km. This Micro Personal Safety Beacon has 200 degrees visibility. The battery lasts up to 3 days. The device has a waterproof and splashproof construction.
The beacon is compact enough to fit in your pocket. It weighs about 20g.[where to find it]
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