A travelling omer counter, so that wherever one is, one's home and synagogue come along for the counting. The enamel drawing on the cover shows rain plunging toward the sea, and a pillar parting the waters: the Sea of Reeds and the pillar of cloud and fire together. Inside, the sefirot are burned into the left leaf and the forty-nine letter pairs and the blessing for counting the omer into the right.
The text
ברוך אתה ה' אלהינו מלך העולם אשר קדשנו במצותיו וצונו על ספירת העומר
Blessed are You, Lord our God, King of the universe, who has sanctified us with His commandments and commanded us concerning the counting of the omer.
The blessing before counting, burned into the right leaf
כתר חכמה בינה חסד גבורה תפארת נצח הוד יסוד מלכות
Crown, wisdom, understanding, kindness, strength, beauty, endurance, splendor, foundation, sovereignty.
The ten sefirot, on the left leaf; the grid pairs the initials of the seven lower ones for the forty-nine days