Is the keyboard and mouse Bluetooth? My machines have built in BT.

No, they can't connect via Bluetooth, this wireless keyboard and mouse use a common receiver, you can take out the receiver from the bottom of mouse and plug into the idle USB port of computer, remember to adjust keyboard’s ON/OFF switch to ON position, then they can be really used.

Questions & Answers: Wireless Gaming Keyboard Mouse and Bluetooth Headset Kit, Rainbow Backlit Rechargeable Ergonomic Metal Mechanical Feel Keyboard with Removable Palm Rest for Laptop PC Gamer

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Wireless Gaming Keyboard Mouse and Bluetooth Headset Kit, Rainbow Backlit Rechargeable Ergonomic Metal Mechanical Feel Keyboard with Removable Palm Rest for Laptop PC Gamer

High Performance Wireless Gaming Keyboard, Mouse, Bluetooth Headset and Mouse Pad Combo
Ergonomic design for wireless keyboard and mouse, the keyboard comes with a phone stand for placement of mobile phones.
Plug and Play, rainbow backlit keyboard make it convenient for usage at night.
26 anti-ghosting keys and the combination of function button make using more fluently and quickly.
This mute wireless gaming mouse with 6 button, 7 color breathing LED backlight, 4 level DPI(800-1200-1600-2400).
Compatible with windows 2000/XP/7/8/10/Vista, etc. perfect for gaming or work or daily using.
Bluetooth Gaming Headset Over Ear Stereo Sound Headphone with Mic For PC/Mac/PS4/iPad.

$65^.99 –