RFID लायब्ररी व्यवस्थापन लेबल: YF294 Light source: 3 high-brightness LED lamps with a lifetime of 100,000 hours Material: Material ABS+LED+Solar Panel+Battery Switch: Button switch on the back Product size: 5.9 (long) × 3. 5 (width) × 1 (thick) cm Product weight: 21 grams Working temperature: -20~+65°C Discharge time: 2 hours continuous lighting time Charging time: 5 hours in the sun can be filled