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OSB-100
1. Luminous Source: 2pcs∮8mm LED . 
2. Lamp housing: Red or Yellow.
3.Flashing frequency : 45 flashes/min. 
4. Side: 360° degree. 
5.Battery: 2PCS  6V H4R25 batteries (1 PCS is also can be operated as usual). 
6.Operating hours: 650-700 hours. 
7. Visual range:250~300 Meters.
8.Switch: Internal switch