RunLessWire - Wireless Switch Click for Philips Hue
Gallery: Dissecting the Philips Hue Tap wireless, battery-less controller | Ars Technica
Lightbee Zigbee Switch: Battery-powered switch with Friends of Hue technology - Hueblog.com
RunLessWire Click for Philips Hue Self Powered (NO Batteries) & Wireless Smart Dimming Switch Friends of Hue Switch Control for Philips Bulbs & Phone ...