Aqara Wireless Mini Switch, Requires AQARA HUB, Zigbee Connection, Versatile 3-Way Control Button for Smart Home Devices, Compatible with Apple HomeKit, Works with IFTTT - Amazon.com
WiFi Button - Thinger.io Documentation
Wireless button on handrail or wall mounted for bus/coach - Vignal| Vignal Group
GoveeLife Wireless Mini Smart 6 Button Sensor, Group Control Multiple Devices, Versatile Control Button, Battery Powered, Supports Most Govee Smart Products - Amazon.com