$20
Luxafor Flag is a light indicator that connects to your computer and let's people know if you're available or busy. It can light up in many colors. It connects to a computer using microUSB.
More info: https://luxafor.com/flag-usb-busylight-availability-indicator/
$20. Cash, FB Pay, Apple Pay, PayPal accepted.
Meet at Stanford Shopping Center or SLAC.
Please do not message this poster about other commercial services.