1. One-handed operation for easy control - The rope reel includes a stopper that allows precise rope release with one hand, enabling simple and reliable use in the field. 2. Retractable and reusable design - A hand crank lets you retract the rope quickly, keeping lines tidy, making storage easy, and allowing repeated use. 3. Durable and lightweight construction - Made of plastic, the snorkeling line wheel is sturdy and lightweight, with good resistance to cracking under normal use. 4. Versatile applications - Suitable for all types of diving, caving, exploring, and other underwater line work. 5. Practical use scenarios - Cave diving: Deploy and control a guiding line to mark passages and ensure a safe return. - Open water exploration: Use a deployable line for locating points of interest, then retract after use. - Training or shallow operations: Practice line deployment and management to improve technique and efficiency.