The original hue tap. These are no longer sold which seems crazy as they were so good. This requires no batteries and can be mounted anywhere.

Selling as I am replacing a number of the Hue products I have.

https://meethue.co/products/philips-hue-tap/

Overview The world's first wireless smart switch that controls your Philips Hue lights, powered by your touch. This light switch can be mounted anywhere or used like a TV remote for your lights. Its range is limited, but its ability to control four scenes (four buttons) and no need for batteries make it a compelling offer.

Range The Tap should be able to communicate with the Bridge from 50 to 100 ft away. If in doubt, take some rough measurements from your Bridge to the location where you are most interested in using the Tap. Anything near 100 ft is likely to have issues communicating with the Bridge.

Specs Switch Connect up to 25 Philips Hue Tap switches to your Hue Bridge Power: Works without batteries: kinetic energy provided by your button touch Wireless protocol: Zigbee Green Power, IEEE 802.15.4 Frequency band: 2.4GHz (2400–2483.5 MHz) Signal range: 49.2–98.4 ft, depending on local circumstances Weight: 3.17 oz Dimensions: 2.95 inch in diameter, 0.98 inch in height Number of configurable buttons: 4 Lifetime: 50,000 clicks Mounting: Detachable remote control or wall mountable