Asterisk 7 Way Flasher 5-LED Blinky Red Bike Safety Tail Light Be seen day and night with this bright red flashing tail light! Can be seen from over  mile (800 m) with 7 custom flash settings Lasts up to 200 hours off of two AA batteries (not included); lightweight (only 3.2 oz) and compact (only 3 wide) Weather and shock proof with a flexible silicon gasket Includes quick-release handlebar/seat post mount, belt/pocket clip attaches to clothing or backpack