Stays connected with your family and friends by getting extra battery power today! This replacement battery has an integrated microchip that prevents overcharging and lengthens battery life. Connects the dock to an electrical outlet using the Micro USB power adapter Samsung I9100 Galaxy S2 dock to charge the device. Best replacement for the original battery with comparable standby and talk time. USA style plugs offers EU plug adapter for the customer who could use this charger conveniently when travelling in European. - Battery Capacity: 1800mAh/3.7V - Charger: - Input: AC 100~240V - Output: DC 4.2V 350mA - USB: 5.2V 800mA - Comes with EU plug adapter