Perfect design for easy storage no matter travelling,office,home and after Gym. Mini size fan makes no pressure to take it anywhere you like. It is very easy to hold in hand or fit into your handbag, pocket, pen container, etc. Package included: 6 mini fans(Black/White/Green/Orange/Blue/Pink)Approximately 9 cm x 4 cm x 4 cm, fan blade length is about 3.75 cm each. Notes before buying: If your phone is an Android system, you need to check the OTG function before using it, you can download the free app "OTG USB Checker" to check. If you need to enable the OTG function, you can search for "OTG" in the settings and follow the prompts to enable it.