- Model: UltraFire WF-502B (Cree R2) - Features a Cree XR-E R2-WC LED emitter - Powered by 1 x 18650 or 2 x 3.0V/3.6V CR123A batteries - Maximim voltage input: 8.4V - 5-mode tail cap clicky switch with state memory: Hi > Mid > Lo > Str