Note: This printer only supports Memobird applications. Specifications: Type: Thermal Printer; Model: GT1 White; Thermal Paper: 57 x 25 mm / 2.24 x 0.98 inches; Power Supply: Built-in 900 mAh lithium battery; System: Android 4.4 & above and iOS ; Connection: Bluetooth BLE 4.0 & above; Size: Approx. 1.57 x 3.11 x 3.11 inches (40 x 79 x 79 mm). Image Color: Black and White. Definition: 200 dpi. Charging Port: 5 V Micro USB Features: Small body and lightweight to carry in your pocket. Photos, graphics, texts, notebooks, web pages, and more; Compatible with printing functions: Others; Bluetooth 4.0 can be printed anytime, anywhere, directly connected, make friends, assistance, learn memos, work notes, and print images. Built-in 900 mAh rechargeable lithium battery can print 8 rolls of continuous paper ● Bits of your life, give your mood and add life fun to life! Key function and light effects: Use it. Red light (gloss): Less than 20%; Red light (constant): Overheating or paper; Green light (constant): Normal working condition; Green light (glow): Red light (glowing); Charges green light (constant); Charging green light (constant); Instructions for normal working conditions: 1. Download the official APP with scanned QR code (English language not guaranteed). 2. Charge your printer for the first time, press the machine for 3 seconds. 3. Bluetooth on your phone will register to your printer app and login to your account. You can print your notebook. Charging: 1. Please insert the printer into the USB cable before starting the first time. 2. When the power button is flashing red, please charge the power to ensure normal operation.