Wireless: 27Mhz

1) Ergonomic design,easy operation and anti-strain-injury
2) Innovative 256 user ID codes,prevent RF interference
3) Radio frequency 27MHz technology,signal transferable
  in 360 degree full angle 800dpi optical sensor
4) Operating range:1.5 meters valid operating distance
5) Auto matically power-saving sleeping installation
6) Mini thumb RF receiver with USB plug
7) Rapid USB recharging functionality saves battery replacement

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Wireless: RF 2.4GHz

1) 2.4GHz wireless Mouse
2) High Resolution: 800~1000 DPI
3) Button Life: 3 million cycles
4) Freely 360-degree use,Max Control Distance: 10M
5) Radio frequency: 2.4GHz
6) Designed for USB applications
7) Mouse battery: 3.7V/100mA Polymer Lithium-Ion Battery
8) Telescopic wire:80CM/100CM/120CM selectable (Charge and Play)
9) Use attention: when the Built-in battery not work,this

product can use
2 AAA alkaline batteries make it work, but when you useing

2 AAA alkaline batteries, please don't charge, because 

that will set the battery off