Please kindly noted that this item is sold by third-party sellers from Joybuy marketplace. HOW TO USE? Download the APP from Google Store or compatible with Apple Store: iPrint. Turn on the Bluetooth of the mobile phone and press and hold the printer power button to turn it on. Click: My>> My device, search for Bluetooth device: GBXX-XXXX, pair with it. Select functions on the APP for printing, and click "Print" to print. All dimensions are measured manually and there may be small deviations. Material: ABS Color: Blue Product Size: 4.3*3.1*1.4 inches Packing Size: 4.72*3.54*3.15 inches Connectivity: Bluetooth, USB Print Type: Thermal Printing Resolution: 200dpi Input Power: DC 5V, 1A Power Supply: Rechargeable Lithium Battery Battery: 3.7 V, 1000mAh Packing Weight: 0.77Ib 0 - No warning applicable 1 - Does not contain composite wood