Operating the 18 MIN! continued Install External Speaker Choose an 8 Ohm external speaker with a 3.5mm omen connector. WARNING: The 19 Min! external speaker output Is a Bridge Tied Load (BTL) design. Do not short the speaker wires to ground as it may damage the speaker amplifier. Keypad Lock 1. Press and hood the MENU key for 3 seconds to lock the Keys. The LCD display wil show the Gr icon 2. When the keypad is locked, press and hold the MENU key for 3 seconds to unlock the keys. The Gv oon tums off.
