Lighting your stepping stones "from within" makes for a safer walkway at night than using nearby landscape lights that may not be bright enough to illuminate your path. Each of these stepping "stones" is illuminated by a single super bright white LED that lights it for up to 8 hours per charge. No wiring or digging needed. Built-in rechargeable Ni-Cad battery is powered by a high-quality Siemens silicone solar cell. Light sensor automatically turns the LED on at night, off at morning. Polyresin and fiberglass construction, so you can step on it without fear! 12- 1/4" square, 2" thick.