The Lezyne Femto rear light is an ultra-compact safety light with integrated lens On/Off switch. Durable machined aluminium construction. Side Visibility lens extends beyond body to provide 180 degrees of visibility. Two replaceable CR2032 batteries power one bright LED. The Lezyne Femto rear cycle light delivers up to 7 lumens with five output/flash options. Versatile 2-in-1 Clip-On System straps to bars or clips to loops.