<p>Specification: Battery capacity :2000mAh 3.7V Battery voltage :4.2 V / 2.7V Charging time :2-3 hours Life span: 200H Motor working life :800H Operating temperature: 0-45℃ Inflation pressure range :0-100PSI Inflation speed: 20L / min Work duration :40 min Working noise: 80dB Charging interface: USB Charging parameter:5V / 2A Size :150 x 60mm / 5.91 x 2.36inchDon't know how to pump ? Just follow these steps: 1. Long press the power button for 3 seconds and wait for the progress bar to complete. 2. Short press the set button to select 5 modes of inflatable spicial scene. 3. Short press the U/LED button to switch the air pressure unit.(1PSI-6.89KPA 1BAR=100KPA 1KG/cm²=98KPA) 4. Short press the preset +/- buttons to adjust the preset pressure. Long press them to adjust the value quickly. 5. Connect air hose 6. Short press the power button to start.Package included: 1 x Air pump 1 x 160mm trachea 1 x Ball needle 1 x Swimming ring mouth 1 x US gas nozzle 1 x USB charging cable 1 x Five-language instruction manualNote: The device can automatically preset the air pressure value according to the scene you choose. The device has a memory function-when you turn it on the scene will be same as that you chose last time. USB output 5V s 2A. You can charge your smart phone once. It needs to be turned on when charging, when the battery is low or the phone has been fully charged, the air pump automatically shut down.</p>