Thinkbee Kinetic Wireless Dimmer Switch Bundle, No Battery Self-Powered Remote Control Dimmable Light Switch for LED Lights Lamps (2 Switches and 1 Receiver)
Brand: Thinkbee

It comes with 2 switches and 1 receiver, you could use one switch to replace the existing switch and the other as a remote control switch or three way switch!

√ Easy to Mount - Wireless remote switch allows you to control any light across the entire house from anywhere. Instantly create a switch at any location without running new wires and tearing walls. Compared with traditional wall light switch, save huge labor and material cost. (3M tape provided for easy installation)
√ Dimmable Switch- Not only a switch but a dimmer. Long press to circularly dim the brightness to suit any activity. Turn on the light again, and it maintains the last light intensity. No need to pay the extra money to buy a dimmer. NOTE: The switch uses TRIAC components and supports incandescent lamp, tungsten lamp and mostly LED lamp which supports TRIAC dimming function.
√ Strong Signal - The self-powered switch converts finger kinetic energy to electricity and sends wireless 433mhz strong signal to receiver to control turning on/off lights. Indoor 99ft / 30m and Outdoor 525ft / 160m. Go through 2 walls without interference problem.
√ Convenient - Mount Thinkbee Wireless Dimmable Switch Light anywhere you want or use as portable remotes. Remote control more convenient and safe for the elders, pregnant women, disables, children, also the young.
√ 12-month Warranty - Rocker switch button life 800 thousand times, up to 20-years lifetime. Switch size is 3.4 x 3.4 x 0.5in and receiver size is 2.4 x 1.7 x 1.1in.