19Uniden MHS550 Radio Owner’s Manual14. PTT — Press to transmit.15. Key Lock ON/OFF — lets you lock the keypad toprevent accidental changes while powered on. The featurebecomes unlocked when powered off and on again. Youcan also quickly disable the feature by pressing and holdingdown this key.16. Backlight — Press briefly to activate the Backlight.17. Battery Connection Area and Battery RechargingContacts— Install the supplied Lithium Ion RechargeableBattery being sure to position the pack as shown in thesection Batteries. To recharge the installed Lithium Ionbattery, place the MHS550 into the Charger Cradle. Thecontacts at the bottom edge of the radio receive the requiredvoltage and current from the cradle to completely rechargethe battery in about 4 hours.18. Battery Latch — Lift the latch to remove and replace theLithium-Ion battery or to install the Alkaline Battery case.19. MIC — Speak clearly into the microphone aperture whentransmitting for best results. Position the microphone at least4 inches from your mouth.
