Stunning Design: Hand laid Sparkly authentic Austrian rhinestone crystals adds sparkle and bling to your office space, a bedazzled office gift. It can give you a better comfortable feeling. It can easily be stored in your laptop bag, which is perfect for travel. Please note: the Nano-receiver is stored inside the back of the mouse. (UPGRADE FUNCTION) RECHARGEABLE AND POWER INDICATOR - Built-in 700mAh large-capacity rechargeable battery, which can be used for up to one month after a single charge. This wireless mouse is equipped with three power indicator lights, and the innovative design can clearly display the power source, saying goodbye to power failure.