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Feature: 1. It can be powered by a mobile phone charger and the interface is MicroUSB. 2. Equipped with acrylic transparent case, DIY on the exterior, making the clock more beautiful. 3. It has 4 keys, namely the menu key, adjustment + key, adjustment-key, and on / off key. 4. The seven-color light can be adjusted to make the clock more cool and stylish. 5. Exquisite workmanship, unique and personalized appearance, small and light. Specification: Item Type: Clock Voltage: DC 5V Current: 1A or Higher Shell Material: Acrylic Lighting: Seven-Color Lighting (Adjustable) Use: Clock Package List: 1 x Clock 1 x USB Charging Cable Note: Comes with a button battery CR1220.4 tubes are not equipped and need to be purchased separately.The nixie tube model is IN-12B, other nixie tubes are not supported.