Tests including key liftspan,withdrawal and insertion force and battery capacitance for speaker.They're used to ensure the following results:

 1.Electronic buttons can meet the requirements of pressing for many times.

 2.Withdrawal and insertion force of USB and audio port reach standard.

 3.Ensure battery capacity is true and enough.

Product testing includes shielding function,high&low temperature and imitation of vehicle transport.They aim to ensure the following outcomes:

 1.Shielding function works while speaker is on.

 2.Electronic device can be used in quite hot and cold weather conditions.

 3.Surely protect the product during transport.

Product testing includes wire rolling and salt spray.They aim to do as follows:

 1.Internal wire is tightly soldered on PCB to avoid any sound disconnection while using.

 2.The electronic device can be used in the sea in case of metal corrosion.