Lacrosse Technology Indoor temperature (F. or C.). Remote temperature (F. or C.). Can receive as many as 3 remotes. Wall hanging or free-standing (removable stand). minimum/maximum memory with time recording. Manual set time. 12 or 24 hour time mode. Indoor temperature range: 32 F. to 140 F. Remote temperature range: -21.8 F. to 156.2 F. Receiver: 2 "AAA" alkaline batteries and remote: 2 "AA" alkaline batteries. Dimensions, receiver: 2.75" x 1" x 4.25" and transmitter: 1.5" x 1" x 5".