Easy to use: just need to install 2 AA batteries (not included) with one push of a button and four modes: steady / blinking / blinking / off. The pack and glasses are connected by a 35 " wire. Cool and Attractive: It's pretty cool and attractive and makes you the star of the parties. Fun for parties, shows, rave concerts and festivals. Stylish: EL wire brings excellent visual impact and longer continuous glow time at night. Stylish sunglasses frames convey a sense of style. Comfortable to wear: Perfect accessories for men and women, young, teenage and old. Easy to see and the light has no influence on the view . Long duration: Sufficient power to guarantee a longer continuous light time (at least two hours, depending on the battery capacity used). Product Product details: - Frame material: plastic - Glasses material: AC - Length of the connected cable: 35 inch - Battery size: 9.1 x 3.3 x 2cm (3.6 x 1.3 x 0.8 inch) - Battery type: 2 x 1.5V AA dry batteries (not included) Main feature: - Can be used for both indoor shows and indoor and outdoor activities. - Stylish sunglasses frames with clear lenses. - Portable and easy to carry. - Use a single button to control four modes: steady on, slow flashing and fast flashing and power off. - No heat generation. - Battery and glasses separate the design and ensure a long experience. Package included: - EL wire glasses * 1 - 2AA battery pack driver (battery not included) * 1 Attention: Do not pull the cord tightly and frequently between the glasses and the battery, otherwise it may fall off the glasses. Do not use the package tightly, use it tightly and the cord is not taut. Warm tips: Sometimes you could hear a slight humming from the battery when it was switched on. It's a normal phenomenon. EL wire annealing requires a high frequency pulsed power source, the frequency of which falls exactly on the frequencies that are more sensitive to hearing. But it's a weak sound and easy to accept for most people, especially if you hide the backpack by your waist or in your pocket.