Coast LED Lenser LL7842 David 15 DigiTac I Stainless Luxeon LED light uses just 1 AA battery Coast LED Professional Use lights feature our most advanced optical and digital technology, combined with out highest wattage LEDs to create lights that meet the highest professional standards. Specially designed for heavy and continuous use, these lights will stand up to whatever abuse your job puts them through Incredibly bright, Professional Use lights use our best technology, including the Prism Reflector System, Power Transformation Technology (PTT), and the Cloverleaf Reflector