The DX300ES system supports hands-free, two-way digital conversations with interfacing for two channels of external radio or intercom communications. Its compact design makes it highly portable and very quick to set up and operate. The MB340ES is a replacement for the MB300ES.Main Features:Up to 4 full-duplex or 12 half-duplex beltpack and/or all-in-one headset users per base stationLink two bases together to support a maximum of 30 usersSecure 64-bit encryptionDedicated channel relays10-pin terminal strip connector for easy connection to 4-wire intercom systemsTriple diversity (space, time and frequency) operation for extreme multi-path environmentsNo frequency coordination or licensing for operationPower via 100-240 VAC, 12-14 VDC, 1.5V AA batteries or an optional rechargeable BAT850 batterySystem Specifications:Frequency Range: All (2400 2483.5MHz) Low (2401.92 to 2439.936MHz) High Band (2443.392 to 2481.408MHz)Frequency Response: 200Hz to 3.5kHzSecurity: 64-Bit EncryptionTemperature Range: 4 to131F (-20 to 55C) Typ.Transmit/Receive: Frequency-Hopping, Spread Spectrum (FHSS)Transmit Power: 100mw BurstModulation Type: Gaussian Filtered FSK, TDMAFrequency Stability: 13ppmHarmonics/Spurious: Exceeds FCC and ETSI Specifications Over TemperatureRF Sensitivity: <-90dBm w 10-3 BERSystem Distortion: <2%Dynamic Range: -90dBm to 20dBm;FCC License: None Required (Approved for Worldwide Use)FCC Acceptance: Part 15Base Station Specifications:Antenna Type: External, Dual Diversity -Wave Dipole, R-TNC Connector (x2)Power Requirements: 100240V AC, 50-60Hz or 12-14V DC or Six 1.5V AA Batteries or BAT850 Rechargeable Battery (Optional)Size: 8 x 8 x 3.5in (20.32 x 20.32 x 8.89cm)Weight: 2.75 lb. (1.25kg) with BatteryAUX I/O: 600 O Balanced, with Level AdjustmentHeadset Connector (x2): Mini-DINHeadset Output: 200mW into 32WRelay: 8-Pin Phoenix NC,COM,NO,GND (x2) 2A @ 30V DC