Perman Water Activated Deep Drop Underwater Diamond LED Fishing Flashing Light Bait Lure Squid Small and Bright, Solid and Durable. Water Activated Deep Drop Fishing Flashing Lights. We call them Duralite Diamond which is a great way for attracting fish in deep dropping fishing. Works in both fresh and salt water. Great Tool to enjoy your fishing activity. Size: 4 x 2.5cm (H x D) (approx). Duration: 300 hours. Rated for a depth over 3000 feet (1000 meters)