Shensee Black Slim 2.4 GHz Optical Wireless Mouse + Receiver For Laptop PC Mac With Receiver Power: 2 x AAA Batteries(Not Included) Effective: 2.4GHz wireless transmission up to10 metres operating distance Wireless carrier frequency: 2402MHz-2480MHz Size:115 x 60 x 20mm Current: 1.5mA 1.5V