Metal Sound Projectors

CELL10T/EN, CELL10T/ENC, CELL20T/EN, CELL20T/ENC
           CELL10/T, CELL10/TC, CELL20/T, CELL20/TC

Metal Bi-Directional Sound Projectors

CELL10BT/EN, CELL10BT/ENC

CELL10/BDT, CELL10/BDTC, CELL20/BDT, CELL20/BDTC