Visit Amazon sites : br BTC? Green Environmental Protection Product BTC-KB1801-N Compact Wireless mboo Bluetooth Keyboardbr br Scissor Architecture keys structuregood feelingdustproofwaterproof br Ultra-thinsmall sizeeasy to carry br Bluetooth wireless connectionwithout taking up a USB interface br With a rechargeable lithium battetyAfter full chargingyou can use it for 50 hours continuously br Iterlligent power saving mode when the keyboard stopped working in a few minutesit will automatically go into sleep modethe power light will be offtapping any key could wake up automatically