The radio accessories are composed of earpiece, integrated coil and wireless PTT (remote control). The integrated coil is composed of receiving device (including PTT button), and inductor (including microphone).

When the above accessories connected to radio, information can be transmitted through the coil.

The wireless PTT is in waterproof design, with its appearance similar to car remote, which can remote the radio covertly, suitably using in special environment.

SP-2FM Integrated Loopset Technical Parameter
Color                                   Beige
Impedance                          ≥40Ω( 300Hz -1KHz)
                                          ≥130Ω(≥5KHz)
Length                                 65cm
Maximum output signal         3.5Vrms
Power supply                       From radio
Voltage                               3.3 V to 10V

Microphone  
Type                                  Omni Directional, Electret
Impedance                         4.4K @1kHz
Frequency Response           100Hz -10kHz
Sensitivity@1kHz (dB re 1.0V/0.1Pa):  -53±2dB
Maximum Output Current     50uA
Voltage                              1.5V to 10V
Operating Temperature       -10℃ ---60℃
 

PTT button
Lifetime                >100000

Wireless PTT 
Operation Principle              NFMI
Modulated                          2-level CPFSK
Operation Range:               <150cm
Battery Type                       CR2450
Battery Operation Time        1 year
Stand-by Current                < 200uA
Operation Current               < 6mA
Low Battery Warning            LED
Dustproof &Waterproof        IP67

Wearing Schematic Diagram