This metal line-in speaker is also a 3000 mAh power bank and serves as a phone stand for many smart phones when the 3.5mm jack is plugged in. Input: 5 V. Output: 2 W. Battery type: rechargeable Lithium. Capacity: 3000 mAh. Plug: 3.5mm audio cable. Packaging: individual white box.3-in-1 Power Bank Speaker Stand. Sleekly styled power bank, speaker and phone stand. This metal line-in speaker is also a 3000 mAh power bank and serves as a phone stand for many smart phones when the 3.5mm jack is plugged in.