Check the listing for details. Wireless Presenter. Condition: Used. Listed at 25.00 USD. This wireless presenter is in excellent condition. Please look carefully at the photos to see the size, cleanliness of the battery compartment and all that is included in this purchase. The following description detail is copied from the Logitech website. The item is being sold on the site for $49.99 dollars.DIMENSIONSHeight x Width x Depth:1.49 in (37.8 mm) x 4.55 in (115.5 mm) x 1.08 in (27.4 mm)Weight: 2.01 oz (57 g)ReceiverHeight x Width x Depth:0.65 in (16.5 mm) x 2.31 in (58.6 mm) x 0.31 in (7.9 mm)Weight: 0.21 oz (6 g)SYSTEM REQUIREMENTSWindows®-based computerWindows Vista®, Windows 7, Windows 8, Windows 10 or laterUSB portTECHNICAL SPECIFICATIONSColor: BlackLaser Class: Class 2 LaserMax Output: Less than 1mWWave Length: 640～660nm (red light)Battery type: 2 AAA batteries not includedBattery life (Laser pointer): 20-hour maximumBattery life (Presenter): 1050-hour maximumWireless operating distance: Approx 10m 2Wireless technology: 2.4 GHz wireless technologySupported OS:Windows Vista, Windows 7, Windows 8Interface: USBAccessories: Carrying caseProduct Origin: China