The EverFlo oxygen concentrator from Philips has a flow rate of 0.5-5 liters per minute. It has 5 liter oxygen capacity, 5.5 PSI outlet pressure, 45dB sound level, 12°C to 32°C / 55°F to 90°F operating temperature, up to 95 % operating humidity, 60Hz input frequency, 350W average power consumption, 120 +/- 10% AC input voltage, 58.4 x 38.1 x 24.1 cm dimension, 14 Kg weight.