1. Install way: Hoist, hang;
2. Structure form: 1 side;
3. Using life: 5 years;
4. Power: 3W;
5. Lighting source: 8pcs green LED inside;
6. Emergency time: More than 4 hours after the power off;
7. Battery: Nicle-cadmium incharge battery, 500 times using life for the usual;
8. Production size: 370*220*40mm