Features: Transmits and receives Very light weight which is very comfortable to wear for long time With heavy duty Kevlar reinforced wire Strain relief cable for maximum durability Loud, clear audio 2.5mm accessory jack for earpiece Speaker Specification: Dimension (mm): ￠32 Sensitivity: 112±4dB Impedance: 8Ω Rated output power: 0.25W Peak power output: 0.5W Microphone Specification: Dimension (mm): ￠6*5 Sensitivity: -38±3dB Frequency: 1kHz Rated output power: 2.0V/2.2KΩ Peak power output: 1-10V Compatible: Alan Midland G5, G6, G7, G8, G9, G10, G12, M24, M48, M99, 445 Sport, 445 BT, ALAN 421, ALAN 441, ALAN 443, ALAN 451, ALAN 456R, MIDLAND Ocean, MIDLAND Atlantic, Alan 42 Alan 39, Alan 507, Alan 607, Alan 643, Alan 654, Alan 95 Plus, Atlantic-i, CT-22, G12 Nautico 1, Nautico 3,Ocean, Pacific, SP-410, SP-420, SP-430, SP-440 GXT Series: GXT255 GXT250 GXT400 GXT444 GXT450 GXT500 GXT300 GXT325 GXT550 GXT555 GXT565 GXT600 GXT635 GXT650 GXT656 GXT661 GXT700 GXT710 GXT735 GXT750 GXT771 GXT756 GXT757 GXT800 GXT808 GXT850 GXT881 GXT720 GXT775 GXT900 GXT808 GXT850 GXT881 GXT720 GXT775 GXT1000 GXT1050 GXT950 GXT740 GXT785 GXT760 GXT795 and more new models...... LXT Series: LXT80 LXT110, LXT112 ,LXT114, LXT210 LXT216 LXT276 LXT310 LXT300 LXT303 LXT305 LXT315 LXT320 LXT330 LXT350 LXT335 LXT376 LXT318 LXT319 LXT322 LXT323 LXT324 LXT340 LXT345 LXT360 LXT365 LXT380 LXT385 LXT410 LXT420 LXT435 LXT440 LXT460 LXT480 LXT490 and more new models...... Other models: XT18, XT20, XT511, XT511MO, G-225, G-226, G-227, G-300, G-300M, MIDLAND NAUTICO