1. Simple operation and easy welding, better sound quality with 4Q3W speaker 2. With RDA5807 radio module, it has the advantages of noise elimination, bass enhancement, high sensitivity,low noise, strong anti-interference ability, etc. 3. Button adjustment, switch channel volume increase and decrease, clear all channels and search and store channels again 4. There are 15 sound gear adjustments, which can adjust to the sound that satisfies you 5. LED lights show the operating status The products which are suitable for electronic enthusiasts to study and repair circuits. We only that the products are in good condition before delivery, and cannot 100percent success after installation. The installation of the circuit requires the buyer to have experience in the circuit, please read the product description carefully before payment. Batteries are not included in the accessories With power-off memory, automatic search and storage function Simple version of RDA5807 radio production kit Power supply: 3 No. 7 batteries or USB 5V power supply (choose one of the two) Cannot be used simultaneously Receive radio frequency: 87-108MHZ Maximum operating current: about 400mA (when volume is adjusted to maximum) Tips: The product may be updated constantly ,Due To Different Batches, The Actual Product May Have Slight Differences Or Color Differences, Which Does Not Affect Use Colour:Photo Color Material:plastic Package Contents: 1 x FM Radio Receiver set(DIY parts, welding and assembly required) 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.