Morse Code Keyer (Speaker not Include) Assembled Electronic Circuit : FA938 Here is an ideal unit for radio clubs and scouting groups to practice sending and interpreting messages using the historic "Morse Code". This kit includes tact switch. ***This kit was not includes a speaker because of it's not allow to ship via Air mail service.*** Power supply : 9VDC. , Electric current consumption : 35mA (max.) Adjust sound frequency with trimmer potentiometer. IC board dimension : 1.95" x 1.08"