Packing list: 1 * 33000 breathing valve 1 * 0.5 gas cylinder 1 * Lost rope 1 * Paper box packaging 1 * Small base air pump 1 * Lost rope Feature: 1. [PRODUCT SIZE AND CAPACITY]: The respirator has a capacity of 1L, and can be continuously dived within 10 meters for 15-20minutes without pressure (depends on vital capacity). The product weighs 2.5kg, and beginners can easily dive in the water. 2. [EASY TO OPERATE ] Portable design, the respirator is full of gas, you only need to put the mouthpiece into your mouth for diving and inhale directly 3. [PRESSURE AND CORROSION RESISTANCE]: The entire bottle of the product is made of aviation aluminum, and the outer body is sprayed with mirror treatment to better resist internal corrosion, and is scratch-resistant and durable! 4. [SAFETY PERFORMANCE] Every diving cylinder is equipped with a real-time waterproof luminous meter. Check the gas remaining in the diving bottle at all times during diving. The use of food-grade silicone mouthpiece allows you to breathe and dive freely. 5.[SAVE MONEY AND TROUBLE] You can use a high-pressure manual pump to replenish the oxygen cylinder, you can also use a diving adapter to fill, or use an electric air pump to inflate, the diameter of the inflation connector is 8mm, it will save you a lot of time!