A blinking light on the base of the SKE Crystal Bar is an indicator that the disposable single-use device is nearing the end of its life. The SKE Crystal Bar is fitted with a built-in 500mAh battery. A 500mAh battery, combined with a 2ml e-liquid capacity will provide up to 600 puffs or draws. When the LED light blinks and vapour production comes to a halt, the device is ready to be safely disposed of.