[Design]:This compact ice box is designed to enhance the cooling effect of appliances like air conditioners,refrigerators,and coolers.It features a rubber plug and aluminum cap for leak sealing.The material meets health standards,offering large cold storage capacity and slow release [Versatile Use]:Ice blocks Ideal for various applications such as food refrigeration,breast milk preservation,air conditioning ice crystals,nursing cooling,cold transport,and refrigerator power outage cold storage [Ice Crystals]:The ice crystals offer a longer time cooling effect compared to regular ice water.They can be reused multiple times for efficient cooling [Easy to Use]:Simply prepare an adequate amount of blue ice boxes and place them in the freezer without adding water.After freezing for 4-8 hours (depending on the freezer temperature),remove the blue ice boxes and add them into your appliance's water tank until it covers the blue ice box [Material]:Ice packs made from PETG material with for dimensions of 4cmx16cm each box; package includes six units of small sized blue ice boxes