【Adjustable light ring】 Lightly press the dimmer button to change the light color: warm light, cold light and natural light; Press and hold the button to toggle the brightness from 1% to 100%. Meet all your needs in different circumstances. Press the button twice in a row to display the SOS flash. 【Rechargeable by USB】 Built-in 200mA lithium polymer battery. Battery life: 60 minutes in single light mode, 30 minutes in dual light mode (brightest mode). The battery with a USB cable (supplied) does not require the frequent purchase and replacement of disposable batteries. 【Multifunctional Selfie Light】 This ring light helps illuminate your face and enhance ambient lighting for a perfect selfie. If you are in a dark environment, it can be used as an emergency light to illuminate the area. 【Portable and easy to use】 Product size: 9 x 9 x 3.1 cm, LED rings won't take up too much space in your pocket. Just attach it to the top of your smartphone or tablet to capture high quality photos and videos for every important moment in your life 【Compatible with all smartphones】 The allowable thickness range of the mouthpiece of the clamp is 0-15 mm. It works for most phones and tablets. Like iPhone XR / iPhone XS / iPhone 8/8 Plus / Sony / Huawei and other phones, iPad and even MacBook. Adjusting the brightness of the light: -Lightly press the button to change the light color. -Long press the button to easily adjust the brightness. -Double-click on SOS Flash. Specifications: Material: ABS + PC Size: 9 * 9 * 3.1cm LED quantity: 20 pieces white LEDs + 20 pieces warm LEDs Light color: warm light, cold light and natural light Battery capacity: 200mAh Charging voltage: 5V / 1A maximum clamp thickness: 0.59 inch Color temperature: 3200K-5600k Note: After full charge, please cut off the power (although there is overload protection, it is always recommended to cut off the power after full charge). Applicable: most digital devices (not covered) up to 0.59 inches thick. Charge the selfie ring light before using it for the first time. If you don't always use the selfie light. To protect its built-in battery, please charge it once a month.