Barricade Lights Features: Green Energy - No Battery Required, Automatic on Dusk/Off Dawn (Flash), Bidirectional, Viewing Distance Over 1 Mile, Flash Automatic when Ambient Light Falls Below 400 lux, Flash Rates 60 Times Per Minute, Light - 2 pieces 5 mm, Super Bright Amber LED 20,000 Hour Life. • Solar Module 0.3 w / Mono Crystalline Panel • Battery - 1.2 V/1800 mAh Ni-MH Battery • Non-Replaceable S.T. • Battery Life - 500 Times Recharging Cycles • Operation Current 60 mA • Battery included • Built in circuit board.