When using Bluetooth, you can connect up to three compatible devices. ThermalTake promises 1ms 2.4GHz operation with a wireless range of about 10 meters and 1.5 months of battery life. Bluetooth 4.2 is the low energy alternative, with battery life listed as up to 2.5 months. Ten-key rollover is supported via 2.4GHz and via wired operation you get NKRO.
ThermalTake sells the W1 via its webshop for $109.99.
Supports 2.4GHz, Bluetooth 4.2 and wired USB connection modes. For Bluetooth, connect up to three compatible devices such as laptops, tablets or phones. Ultra-durable PBT keycap design. Comes with an integrated ergonomic wrist rest. Available in Cherry MX blue and red switches