STARK SGS10-L Walky Talky Radio Communication System. STARK SGS10-L Walky Talky FM Portable Two Way Radio. STARK SGS10-L Walky Talky High Performance and Distant Voice Quality FM Portable Two Way Radio. STARK SGS10-L Walky Talky The high capacity 3000mAh Li-ion Battery provides 350 hours in standby, which will benefit long shifts workers.