May be powered by crank, internal AAA rechargeable batteries, external DC; also compatible with solar, car & AC converters. MUCH MORE PRACTICAL SHAPE AND SIZE THAN OTHER UNITS: Shaped like walkie-talkie; telescoping antennae & foldaway crank provide compact profile; weighs just 9.5 ounces, 2.5' wide, 5.5' tall, and 1.7" at thickest point; fits nicely in hand, holster, pocket, or glove box. LONG LIFE: Instead of the usual cheap built-in battery-pac, power is stored in 3 'AAA' common NiMH rechargeable batteries that may be recharged 1000's of times. +++++++++++++++++++++++++++++++++++++++++++ IF USING TO CHARGE CELL PHONES/OTHER DEVICES, PLEASE READ BEFORE ORDERING: There are 100s of different connectors in use with cell phones and battery-powered devices. The included 3-PRONG ADAPTER CABLE (pictured) allows your radio to connect directly to many Nokea and other cell phones and battery operated devices. However, virtually any cell phone or device may be connected by combining the included 3-PRONG ADAPTER CABLE with an ADAPTER TIP (generic multi-phone set pictured/not included) designed for your specific phone or device OR by combining your MALE CAR CABLE (usually furnished with your cell phone) with an inexpensive FEMALE ADAPTER CABLE (pictured/not included).