Check the listing for details. Clear-Com CZ-WH220 2-Channel All-in-One Wireless Headset. Condition: New. Listed at 1110.00 USD. A light-weight, single-ear, all-in-one wireless headset, Clear-Com's WH220 operates in the 2.4 GHz frequency range. It works seamlessly with the Clear-Com DX100, DX121, DX200 and DX210 wireless systems (all sold separately), and uses BAT50 Li-Ion Batteries. The WH220 has a rugged, reinforced casing and long lasting keypads with no mechanical switch. The WH220 features a lightweight, balanced design and wire-free steel headband for all day comfort. Using the BAT50 Li-Ion battery, the WH220 has up to 12 hours of battery life. Single-channel operation allows any four all-in-one headset users to engage in simultaneous, full-duplex communication. In dual-channel operation, three users may be in full-duplex with up to 12 users is in listen-only mode.Clear-Com WH220 Features:2-channel2.4 GHz frequency range3.5 kHz wide band audioUp to 15 beltpacks and/or all-in-one headsets on a single systemUp to 12 hours of battery lifeClear-Com WH220 Specifications:Channels: 2 audio channelsFrequency Range: 2400 MHz – 2483.5 MHzFrequency Response: 200 Hz –3.5 kHzAntenna: Internal, horizontal/vertical diversityHeadset Connector: 4-pin, mini-DINMicrophone: ElectretHeadset Output: 160 mW into 32 ΩCommunication Security: 64-bit encryptionSystem Distortion:Controls: Power, Volume-Up, Volume-Down, IC1, IC2, ISOIndicators: Dual-color LED (red/green)Battery Requirements: 3.6 V lithium-ionBattery Life: Up to 12 hoursAntenna: InternalTransmitter:Type: Frequency Hopping, Spread Spectrum (FHSS)Transmit Power: 100 mW burstModes: Momentary or LatchType: Gaussian filtered FSK, TDMAFrequency Stability: 13 ppmHarmonics/Spurious: Exceeds FCC and ETSI specificationsReceiver:Type: Frequency Hopping, Spread Spectrum (FHSS)RF Sensitivity:Frequency Stability: 13 ppmDistortion:Environmental: 32 °F to +122 °F (0 °C to +50 °C)Weight: 5.7 oz. (0.16 kg) including battery