First of all, I clean the outside of the radio with some alcoholic liquid and cotton swabs or cotton pads carefully. Then, I partially remove the circuit board of the radio and add a new Bluetooth amplifier board and new high-quality speaker as well. The new radio has additional function buttons such as Play/Pause, Next, Previous, Volume up and down. However, the original ON/OFF button has the same function. It has an 1100 mAh rechargeable Li-ion battery which provides 8-12 hour run-time! You can charge the radio with micro-USB cable. The Harman/Kardon speaker has 3W performance and rich sound. Moreover, the radio has two indicator LEDs for standby state and charging state.