<b>Warmly Noted:If you receive a product defective or doesn't have an usb cord,please just feel free to contact us directly through the Amazon message box,and we will resend you it for free.<b/><br> Product Name: Hydrogen-rich water cup<br> Product size: high 223mm cup diameter 67mm <br> Cup material: borosilicate glass<br> Product weight: 0.65kg<br> Number of jobs: 12-15 times after full charge <br> Working temperature: 0-60 degrees <br> Hydrogen concentration: 600-900PPB <br> Product capacity: 450ML <br> Rated voltage: 5V<br> Maximum power: 4W<br> Full charging time: 3-3.5 hours<br> Electrolysis time: 3 minutes<br> Function: Health<br> Product Details:<br> 1) The built-in sealing ring is made of food grade material to prevent leakage.<br> 2) Feel good, one button to start, easy to operate. 3) The bottom soft rubber anti-slip bottom pad has a good anti-slip effect . 4) Round and smooth, no wounds, more comfortable when drinking water. 5) USB charging cycle <br> Note: Please charge in the empty cup state.<br> Prompt: 1. Please reserve 1cm space in the bottle (keep the water level 1cm lower than the bottle mouth). When producing hydrogen, the pressure difference between the inside and outside of the bottle after hydrogen production will cause the bottle cap to become larger. A little tightly opened. <br> 2.Do not use electrolyte-free water, such as purified water, distilled water, etc. Tap water needs to be boiled or filtered, and the temperature should not exceed 50 degrees.<br> 3. Hydrogen water bottle, only increase the hydrogen concentration, electrolysis will not change the pH value of water. This is a "HYDROGEN" water maker, not ALKALINE. If you wanted to change the PH of your water, you need to get an ALKALINE water maker.