Application: -150°C Cryo Freezer provides a safer, more convenient and economical alternative long term storage method than LN2 containers. We design it to provide a storage environment that is about 20°C colder than the water re-crystallization temperature, the freezer is suitable for storage of a variety of biological samples, such as virus, erythrocytes, leukocytes, cutis, skeleton, sperm, oceanic products, special test materials and even electronic products for testing. It can be installed in institutions including blood banks, hospitals, epidemic prevention services, research institutes and research laboratories.