Description Optia Flashing Lure Enhancers Free Diver: Submersible Fitted with Lithium Battery Size: 7.5cm Unit Weight: 12.9g Solid colour battery life: approx 150 hours Disco colour battery life: approx 30 hours Depth rating: approx 700m Diamond Head: Submersible Fitted with lithium battery Size: 2.5cm diameter x 4.5cm length Life rating: approx 200 hours Depth rating: approx 1000m Unit weight: 18g Mirco Submersible Fitted with lithium batteries Size: 2cm Unit weight: 2.9g Solid colour rating: approx 150 hours Disco colour rating: approx 80 hours Depth rating: 300m Inline: Submersible Fitted with lithium battery Size: 5cm Unit weight: 10g Life rating: approx 80 hours Depth rating: approx 700m