Hi Can you please review our web site ? Our product is Licenced Product, called Restaurant Powerbank and Hotel Power bank. It is full 50.000 MAH capacity, produced with Original Samsung Batteries. Have 4 USB Pors and can charge 8 device at the same time. Product Details : 50.000 Mah Capacity ( 41.600 mah real ) Original Samsung battery ( 16 x 2600 mah ) Perfect design 4 usb port ( 2.1A 2 ports and 2 built in cable ) Suitable with all mobile phones and tablets 2 pieces 3 in 1 usb cable ( Total 6 usb connector ) 12 W adaptor, guarantee certificate, user maneul ( Package details ) Both side Advertising option ! You can put your insert print, advertisement or your restaurant menu on product. No need to make any laser print. It is very easy. in 10 seconds, you can put your advertisement on product. Can charge 8 mobile device at the same time Can charge 20-25 times for a mobile phone ( for example IPhone5 have 1400 mah battery. Our product can charge it 30 times ) For example ,can charge Samsung S5 13-15 times. It depends on capacity of mobile phone battery. You can charge our product in 12-15 hours with adaptor. 4 led Charge indicator on product. 1.5 kg ( 25 x 12 cm ) Here is the link : Desktop Powerbank http://restaurantpowerbank.com/