Specifications: 

RECEIVER:
*Temperature measure range: 0~+50C(32~122F)
*Record the maximum and minimum temperaturey;
*3V (2pcs AAA  Alkaline battery),low battery icon display;   
*One receiver can receive three transmitters signal,and dispaly on screen cycle
TRANSMITTER:
*Temperature measure range: -50~70C(-58~158F) 
*3V (2pcs AAA  Alkaline battery),low battery icon dispaly on receiver screen;      
*Distance of transmit is 30 meter in open area.
*Waterproof  level:IPX7