Color: Black Retevis RT21 H-777S Six way charger compatible with Retevis RT21 H-777S (NOT for H-777 RT22) RT21V RT28 RT53 two way radios and batteries; allows you charge six walkie talkies more efficient and faster at once Advanced materials for long period safe use; safe and reliable; with multiple safety protection of overcharge protection; over voltage protection and short circuit protection Power switch button on the base allows you control the charging process while not turn off the power; charging Indicator for convenient to easy use 100-240V power supply for international use; adapter and pin detachable make it easy for you to choose the your local pin Multiple charging protection; overcharge protection; overvoltage protection; short circuit protection; it's safer to charge your radios.