Specification: _x005F_x000D_ 100% brand and high quality _x005F_x000D_ Material: metal + plastic _x005F_x000D_ Color: red _x005F_x000D_ Size: approx. 122*66*26mm _x005F_x000D_ Frequency Range: 525-1605KHz _x005F_x000D_ Output Power: 100MW _x005F_x000D_ Power Supply: 3V (No. 5 battery) (Not included) _x005F_x000D_ Circuit theory introduction: the main properties of the 108-2 7 transistor radio frequency range: 525~1605KHZ _x005F_x000D_ Speaker: approx. 57mm diameter, 8 ohm _x005F_x000D_ _x005F_x000D_ Feature: _x005F_x000D_ Secondary intermediate standard circuit. _x005F_x000D_ Has been adjusted in the 465KHz. _x005F_x000D_ Circuit at all levels have Ic test port. _x005F_x000D_ The whole machine contains 7 triodes, so it is called a 7-tube radio. Among them, the triode V1 is the frequency conversion tube, the V2 and V3 are the middle discharge tubes, the V4 is the detection tube, the V5 is the low frequency preamplifier tube, and the V6 and V7 are the low frequency power amplifier tubes. _x005F_x000D_ Fine workmanship. _x005F_x000D_ Easy to assemble. _x005F_x000D_ Long service life. _x005F_x000D_ _x005F_x000D_ Package included:1 set x Radio Electronic DIY Kit _x005F_x000D_ _x005F_x000D_ Note: _x005F_x000D_ Please allow 0-1cm errors due to manual measurement. _x005F_x000D_ This kit is for learning purposes only _x005F_x000D_ Item color displayed in photos may be showing slightly different on your computer monitor since monitors are not calibrated same.