- Single channel JFET board preamplifier - Input impedance: up to 10 MOhm - Output impedance: less than 3.5 KOhm - Operating time with 9V alkaline battery: 1500 hours (not included!) - Operating time with 2 CR2032 button batteries totalling 6V: 750 hours (not included!) - Dimensions: 28.5 x 18.5 x 4.5mm - Includes belt clip EUR 38.00 - See more - Buy online