Economical USB rechargeable
No need to replace batteries or buy new batteries, just charge in 40 minutes and you can use it in 3 hours.
Can charge commercially available USB chargers, computers, mobile batteries, etc.
Precautions for Use:
Waterproof level is for daily use, please avoid wearing in rainy days.If you are not using it for a long time, please remove the batteries from the main unit and store them away.Please do not touch the battery with wet hands as this may cause heating, ignition, or electric shock.Do not store in extreme low or high temperatures, as well as in places with high humidity and dust.Please do not expose it to strong shock, such as dropping or collision.The silicone part can bend freely, but do not warp the other side.It may damage the wire.