Small but resilient, the ResQLink 400 has been professionally engineered and tested to ensure it can withstand even the harshest elements. This buoyant Personal Locator Beacon requires no subscription for use and can be utilized to enhance your safety in a wide variety of environments. Whether on land, at sea, or in the air, trust that the ResQLinks satellite precision and military durability, puts rescue in the palm of your hands. 4.52 (L) x 2.03 (W) x 1.49 (D)