4 ohm 3W internal magnetic speaker, clear sound quality, no distortion, rich and natural sound Multi-angle rotating pull rod antenna, can rotate up and down, left and right, and stretch length 300mm Can connect to external headphones, 3.5mm universal headphone jack Mini and compact Made of high-quality materials, sturdy and Name: FM radio production kit Control chip: STC81K17 Power supply: 3 AA batteries, 3.7V lithium battery must be prepared Speaker: 1.5-inch 4 ohm 3W speaker (outer diameter 40mm) Search range: 50-108 MHz Signal-to-noise ratio: 60dB Sensitivity: Less than 10uV Frequency response: 150Hz-20KHz Colour:As Shown Material:plastic Package Contents: 1 x DIY Kit(With charging module) Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.