Product Selling Point: 1The whole machine contains 7 triodes, so it is called 7-tube radio. 2Condition: 100% Brand New Item Type: Radio Electronic DIY Kit Frequency range: 5251605KHZ Output power: 100mW (upper limit) 3Speaker: 57mm, 8 Power: 3V (2 x AA batteries) (battery not included) Volume: Approx. 122 66 26mm / 4.8 x 2.6 x 1in 4The outer casing plastic is new material, durable and long lasting,Fine workmanship, Easy to assemble. 5The secondary medium amplifying tube is standard circuit, and the intermediate frequency has been adjusted to 465KHz. 6Among 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. Product Specification: Product Name:Electronic HX108-2 DIY Kit Materials:metal + plastic Size:approx. 122*66*26mm Color:As picture Weight:200g Frequency Range: 525-1605KHz Output Power: 100MW Power Supply: 3V (No. 5 battery) (Not included) Package include: 1 set x Radio Electronic DIY Kit Note: 1.Please Allow 1-2cm Differences Due To Manual Measurement. 2.due To The Light And Screen Difference,The Item Is Color May Be Slightly Different From The Pictures. Service Guarantee: If you have any questions about our products, please feel free to contact us, we will provide you with quality services and the best solutions.