Features: USB rechargeable, it charges from your computer or any device with a USB port. 3 light modes, high/middle/flashing mode for different occasions. Adjustable clip, apply to most mobile phones,the width can be adjusted 58-90mm, non-slip and stable, it can ensure that the mobile phone will not fall. 130db high-decibel speaker safety warning, 5 sounds. Smart batterys indicator, know the chargings status and remaining powers at any time. 4000/2400 mAh batterys, also as a power-bank. IPX4 waterproofdesign, can be used on rainy days.