... battery and controller all in one, don't need any cable,;2. Installation is very convenient, use ... the battery or light source need to be replaced, don't need a professional personage to do maintenance. ... provide super-bright light from little power, need simple thermal management, and last up to 50 ... 5 ~ 7 years of maximum life, with a 2-year warrantyBenefitsNo line voltage, trenching, or meteringNo ...