CTX Virtual Technologies The VK200 KEYFOB Virtual Keyboard - Manual (Page 47)

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Electrical Characteristics
Item Specification
External Power Supply USB Power / less than 5V 500mA
Battery & Capacity Lithium-ion Polymer Battery,
500mAh(MAX) @ 3.7V
Battery Operating
Time Approx. 120min
Battery Charging Time Approx. 240min
USB Interface USB 1.1 & 2.0, USB HID Ver 1.0
Bluetooth v2.1, HID Profile Ver 1.0
Frequency Range 2402-2480MHz
Channel 79
Modulation GFSK