Honeywell TH1100DV1000 Non-Programmable Heat Only Thermostat, White, 1 Pack, Used. 

For low voltage (24V), 3 wires (R-C-W) heating system, including hydronic radiant floors. Can be powered by battery on a 2 wires system.

Backlit digital display. Heat/off switch on side. No wifi.

See mfg's documentation : 

PRO 1000 Vertical Heat Non-Programmable Thermostat

See my other listing for in-floor sensor thermostats.