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Product parameters: Battery: 3.7V 130mAh Alarm duration: 70 minutes Lighting duration: 240 minutes Flash duration: 300 minutes Product size: 100mm * 31mm * 13.5mm Net weight of product: 28g Product features: 1. 130dB high decibel alarm. 2. Integrated design structure, more firm and more resistant to falling. 3. Built in battery and Type-C charging port, convenient charging without changing battery. 4. Flashlight function. 5. Low battery reminder: LED flashes 3 times and emits a drip sound when the battery is too low. 6. Charging reminder: the red light is always on when charging, and the green light is always on when charging.