Lsh left shifts the integer part of the displayed value (multiplies it by 2) n times, where n is the next input number, and gives an integer result (base is set to Bin):
10 Lsh 3 = gives 80 (10 multiplied by 2 three times).
10.345 Lsh 3 = also gives 80.
Rsh right shifts the value (performs an integer divide by 2) n times.
16 Rsh 2 = gives 4 (16 divided by 2 twice).
16.999 Rsh 2 = also gives 4.