Product features: 1. Automatic constant temperature with high temperature protection. USB plug compatible with mobile phone charger or power bank. 2. 26C constant temperature control. 3. Quartz explosion-proof material for safe operation. 4. Compact design with 52mm heating rod, approximately thumb-sized, sleek and space-saving. 5. Operates effectively at water levels as low as 2cm. Suitable for both fish and turtles. Can be used in freshwater and saltwater aquariums, pet feeders, and similar applications. Product name: Mini Heating Rod Main unit dimensions: approximately 8.5 x 1.8cm Intended use: small fish tanks, pet water dispensers Temperature control range: 26C constant temperature Power: 10W Input voltage: 5V 2A Recommended for water capacity up to 25L Note: - Use a 5V 2A charger for optimal performance. Inadequate current may result in malfunction or failure to heat. - This product is suitable for water capacity up to 2L. - Two heating rods can be used in the same tank to increase heating capacity. For example, two units can be used in a 4L tank. - Only one heating rod should be connected per charger or power bank, even if multiple USB ports are available, to avoid heating failure or reduced performance. Material: Glass Color: Black Package Contents: 1 x Mini Aquarium Heating Rod Note: Light reflection and display differences may cause slight color variation between the product image and actual item. Measurement may vary by +/- 1-3cm.