Nobsound Unique Retro Style USB Single-digit Nixie Tube Clock Mini Acrylic Case QS30-1 very special gift; single digit nixie clock USB power supply; personality and warm Precision, Power off still memory time, easy adjustment The five clocks are just for reference. Please note this listing is for one. Size: 50 * 50 * 50 mm / 1.97 * 1.97 * 1.97 in; Power supply: USB DC 5V 0.2A Nixie Tube: QS30-1