Philips Hue Smart Wireless Dimmer Switch V2 (Installation-Free, Exclusive for Philips Hue Lights) for Indoor Home Lighting, Living Room, Bedroom.: Amazon.com: Tools & Home Improvement
changing the battery on a hue button... : r/Hue
Gallery: Dissecting the Philips Hue Tap wireless, battery-less controller | Ars Technica
Philips Hue Tap: The best smart-home gadget you're not using - CNET
Philips Hue Dimmer Switch Battery-powered control for Hue lighting at Crutchfield