$19.99 - $4 (AC) = $15.99 w/ coupon code SC45S4MA

Easy install: No batteries, No wiring and No tool require, easy to fit.
Environmental Friendly: Convert solar energy into electric energy to light the road
Intelligent Energy saving: Bright light and Dim light auto changed by sensor activating
Durable, weather-resistant and heatproof plastic construction.
Solar panel life span: 5 years - LED Life Span - 50000 hours