Lezyne Rear Light: Femto Drive -

CNC-machined aluminum body with integrated lens switch, water-resistant design
Side visibility lens: frosted lens extends past body for 180° of visibility
Durable rubber strap
Battery: 2x CR2032
Power modes: 4 flash (60h) / 1 solid (30h)
Clip-strap back cap design with integrated strap/belt-clip attachment makes it really easy to attach anywhere: jacket, bags, etc.
Coarse threaded back cap: easy battery replacement and resists cross threading