By effortlessly rotating the hydraulic button, you can adjust the resistance between 22-440 lbs, allowing for a customizable workout experience. The dual-layer steel construction ensures that the Chest Expander Arm Exercise Equipment can withstand stronger force challenges, providing durability and reliability. Its simple construction and compact size make it easy to keep your muscles in training at all times, no matter where you are. Additionally, it features a slight hydraulic rebound and has been safety tested for 100,000 uses, ensuring safe and effective exercise. The retaining clasp keeps the Chest Expander Arm Exercise Equipment compressed, making it easy to carry and store.