... up to 17%,20 years life,5 years guarantee.2. maintenance-free lead-acid battery,over charge & discharge protection.with high quality ... years life, 3 years guarantee.3. controller: solar digital programmable intelligent controller, switch on/off by light and time.Full power ... ~5 years life, 3 years guarante.4. light source: imported LED light source, 20W~84W.80~90 120~130lumen,80000hrs life,less ...