D........t

Do you want a pen that you need to look up directions how to use? Do you want a pen that only blinks red despite the fact that it's been charging all night and the cartridge works just fine in other batteries? Well then this is your best option, got to use it once now it just blinks red, I can get it to blink blue, to turn it off or on but then just back to a $20 blinking red light.