Motorola RDU4160D 4-Watt Walkie Talkies measure an extremely compact 5.1″ (H) X 2.5″ (W) X 1.3″ (D) and weighs only 9.9 ounces (with battery). The radios also feature keypad lock, 3 audible call tones, channel scan with selectable scan list, signal strength indicator, 5 programmable buttons, 3 voice inversion scramble settings to minimize eavesdropping, VOX capable with optional headset (boom, or surveillance-styles available), LCD display and battery guage.
With user-selectable 2 or 4 Watt power setting these UHF frequency radios can be set to maximize battery life or range. Using a 2400 mAh battery provides approximately 18.5 hours of talk-time. At the 4-Watt setting the radio has an effective range in metal and concrete structures of approximately 350,000 square feet, or 30 floors.