usb numeric keypad lapcomputer pc external numerical keyboard driver no switching for windows xp win7 win10 mac ios android linux

1.support window10,android,mac ios,linux, rs232 485ttl serial communication protocol and other systems,suitable for all kinds of notebooks,tablets,deskcomputers,industrial computers,mobile phone systems,without drivers,plug and play,and notebooks and other pcs there is no conflict in simultaneous use of computers--- 2 waterproof,oil-proof,abrasion-resistant font,non-fading,durable,artificial design,slightly inclined shape to reduce hand pressure,good button flexibility,multi-function buttons