"And YAHVEH spoke to Moses, saying,
'Make two trumpets of silver. Make them out of a whole piece of beaten silver
and use them for the calling of the assembly and for sounding the order to break camp'"
Numbers 10:1-2
TRUMPETS (chä-tsots-rot') [H2689] pl. 1. a pair of non-musical metal signaling devices used by the Levite priests to signal the breaking of camp, assembly and in conjunction with various ritual functions. Originally crafted as a pair out of a solid piece of beaten silver, the instruments consisted of a mouthpiece, a straight bore body terminating in a flared bell and measured about 45cm (17.75") from the bell to the mouthpiece. Like the shofar, sound is created by buzzing the lips on the mouthpiece while blowing. Also like the shofar, the calls of the two silver trumpets consisted of varying sequences of long and short tones.
Numbers 10:2, 10:8, 10:9, 10:10, 31:6; 2 Kings 11:14 (2x), 12:13 (12:14 JPS); Ezra 3:10; Nehemiah 12:35, 12:41; Hosea 5:8 (traditionally translated as a single trumpet - chä-tsots-rä'); Psalm 98:6; 1 Chronicles 13:8, 15:24, 15:28, 16:6, 16:42; 2 Chronicles 5:12, 5:13, 13:12, 13:14, 15:14, 20:28, 23:13 (2x), 29:26, 29:27, 29:28 (total 28 occurrences)
The Two Silver Trumpets with related coin from the bar Kochba revolt
For expanded documentation see Reference Section: The Two Silver Trumpets of the Levite Priests.