Product features: 1. Automatic constant temperature and high temperature protection. USB plug can be connected to the mobile phone charger or power bank. 2. 26°C constant temperature control. 3. Quartz explosion-proof material for safe operation. 4. Compact design with a 52mm heating rod, approximately thumb-sized, sleek and space-saving. 5. Operates at low water levels down to 2cm, suitable for both fish and turtles. Can be used in freshwater, saltwater aquariums, and pet water containers. Product name: Mini Heating Rod Main body size: approximately 8.5 x 1.8cm Intended use: small fish tank, pet water dispenser Temperature control: 26°C constant temperature Power: 10W Input: 5V 2A Recommended for water capacity up to 25L Note: Use a 5V 2A charger for optimal performance. Using a charger with insufficient current may result in improper heating. This product is suitable for water volumes up to 2L. Multiple heating rods can be used in the same tank to increase heating coverage. For example, two rods may be used in a 4L tank. However, only one heating rod should be connected per charger or power bank, even if multiple USB ports are available, to avoid heating issues. Material: Glass Color: Black Package Contents: 1 x Mini Aquarium Heating Rod Note: Light reflection and display differences may cause slight variations in color between the image and the actual item. Measurement may vary by +/- 1-3cm.