Features: With the ready-made FM radio module produced by a radio, hands-on welding amplifier and indication of the 2 parts of the circuit can be. Amplifier circuit using imported devices PAM8406 composition, the output power of 5W. 2-way indicator using KA2284 composition. Can be used at home, school labs or outdoor activities, allowing users to enjoy the fun, and can always listen to your favorite radio programs! Note: work can not touch the back of the module components, so as not to affect the normal operates of the module or cause short-circuit burn module. This module is a radio sensitive device, interference from the power supply or nearby may affect the normal operates of the module. This module is a radio sensitive device, interference from the power supply or nearby may affect the normal operates of the module. Specifications: Supply voltage: 5.0V-5.5V Current 500MA-2A Amplifier and indication PCB board size:about 9.5CMx2.9CM/3.74x1.14in Speaker: 4Ohm 5W Amplifier power: 3W Sound channel: 2channel FM receiving frequency adjustment: 87.0MHz-108.0MHz Full Package Includes: 1Set FM Radio Assemble Set note: Due to problem of lighting effect and shooting, there might be tolerances in product, please understand. Please allow 0-1cm error due to the measurement