I've got the Femtos and Fleas (sounds bad) and the Femtos are not as bright nor USB rechargeable.
Bit late, but the exposure tracer is usb and will work on straps...
Don't see why you'd choose to put it on something that moves relative to the ground like a strap when it's so easy to put on bars though?
@Khornight2 started
London Fixed Gear and Single-Speed is a community of predominantly fixed gear and single-speed cyclists in and around London, UK.
This site is supported almost exclusively by donations. Please consider donating a small amount regularly.
Bit late, but the exposure tracer is usb and will work on straps...
Don't see why you'd choose to put it on something that moves relative to the ground like a strap when it's so easy to put on bars though?