This battery activation detection board adopts quality soldering crafts, wear-resistant design of the back plate, solid and firm, with fine durability and can provide long service time. 4.2V regulated output, overload and overvoltage protections, more effective protecting batteries. Accurately monitor the real-time output voltage and current values of the activation board, and measure the empty/load voltage of USB powered devices. Automatic identification positive and negative anodes. With automatic power-off function. High compatibility, compatible with iOS and android system Features: Adopts quality soldering crafts, wear-resistant design of the back plate, makes the product is more solid and firm, with fine durability and can provide long service time. 4.2V regulated output, overload and overvoltage protections, more effective protecting batteries. LED display, accurately monitor the real-time output voltage and current values of the activation board, and measure the empty/load voltage of USB powered devices. Automatic identification positive and negative anodes function, different manufacturers have different positive and negative poles, so that the power supplys is opposite, intelligent recognition makes use more safer. Multiple interfaces design, with Type-C/USB/Alligator clip three interfaces, you can use according to demand. Reserves with pointer table interface, it can be externally connected to pointer meter. One-click activation, click the activation button to activate, and switch to automatic quick recharge after activation. Equipped with automatic power-off function, when the battery is fully recharged it will automatically power off, and the blue indicator is off too. High compatibility, compatible with iOS and android system, suitable for most mainstream smartphone model on the market. Specifications: Name: Battery Activation Detection Board Model: BA27 Material: printed circuit board Voltage: 4.2-4.5V Display: LED Item size: 140 * 60 * 10mm / 5.51 * 2.36 * 0.39in Item weight: 47g / 1.66ounce Package size: 167 * 82 * 18mm / 6.57 * 3.23 * 0.71in Package weight: 75g / 2.65ounce Packing List: 1 * Battery Activation Detection Board Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.