Motorola RDU4100 Business Two-Way Radios with HKLN4606 Speaker Mics 4-Pack 4-Pack includes 4-Motorola RDU4100 Two-Way Radios, 4 - 2400 mAh Li-ion Rechargeable Battery, 4 - 10 Hour Plug-In Charger, 4-Spring Loaded Belt Clip, 4-Antenna, 4-Speaker Mics HKLN4606 Range up to 350,000 sq. ft. or 30 floors indoors,10 pre-programmed channels to communicate with separate work groups 4 Watts of power,89 UHF business-exclusive frequencies and 121 interference eliminator codes Repeater Capability, 3 Voice Scramble settings to reduce eavesdropping AA Battery Compatible (requires 5 AA cells & alkaline battery frame accessory)