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Clock Fan for Laptop / Power Bank, Really Cool! Features Working Volt: DC 5V Working current: ≤350mA Switch: keyswitch Product length: 40cm Fan diameter: 34.6 inch Weight: 54g Manual 1. Plug into a USB port and press the ON / OFF switch to turn fan on and to activate the clock display. 2. Press and hold the ON / OFF button until minute hand starts blinking. 3. Setting the hour hand:continue to hold ON / OFF button to set the hour hand.The clock will spin clockwise fast,release the button just before the correct hour. 4. Setting the minute hand:After the hour is set,the minute hand will flash,Click the ON/OFF button to move the minute hand forward to the correct time. 5. Leave for 6 seconds and the time is set. Half Year Money Back Guarantee & Lifetime Product Warranty We promise Half Year Money Back Guarantee & Lifetime Product Warranty. If you have any issue with your product, contact us and our team will respond to you within 24 hours.