Buy-in for a proper e-bike starts in the four-figure range. For those seeking a less expensive alternative, this tiny Kamingo device from China turns regular bikes into e-bikes for a few hundred dollars.

It consists of three components: A motor that mounts to the seatpost and drives the bike's rear tire via friction; a cylindrical battery that fits in a water bottle cage; and a handlebar-mounted controller.

The manufacturer (also called Kamingo) says the initial installation takes just three minutes, and that once installed, the valuable bits can be popped on and off in seconds, tool-free.

Once installed and engaged, the 266Wh battery can deliver 750W, which is good for a 90km (55 mile) range. It reportedly provides pedal assist up to 32 km/h (20 mph). You can disengage it on-the-fly using the controller.

The device has been a smash hit on Kickstarter, garnering a staggering $700K at press time, with 42 days left in the campaign. Expected to retail for around $600, the early-bird pricing is $355.

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