Automatic constant temperature with high temperature protection. USB plug compatible with mobile phone chargers and power banks. External temperature control with a range of 15–34°C. Made with quartz explosion-proof material for safe operation. Compact design with a 52mm heating rod, approximately thumb-sized, sleek and space-saving. Operates efficiently at water levels as low as 2cm. Suitable for both freshwater and saltwater aquariums, pet feeders, and similar applications. Product name: Mini Heating Rod Power cord length: 1m Intended use: small fish tanks and pet water dispensers Temperature control range: 15–34°C Input power: 5V 2A Recommended for use in water volumes up to 2L Note: Use a 5V 2A charger for optimal performance. Chargers with lower current output may result in malfunction or failure to heat. This device is designed for 2L water capacity. For larger tanks, multiple units may be used separately. For example, two units can be used in a 4L tank, each powered by an independent 5V 2A source. Only one heating rod should be connected per charger or power bank, even if multiple USB ports are available, to avoid insufficient power delivery and heating issues. Rated power: 10W Color: As shown in images Material: Plastic Package Contents: 1 x Mini Fish Tank Heater (adapter not included) Note: The package includes only the items listed above. Other accessories are not included. Due to lighting effects and monitor settings, actual product color may vary slightly from images. Measurement tolerance: ±1–3cm.