I bought this to try it out, but the trackball doesn't suit me, so I'm selling it. 【Ergonomic Design】 This ProtoArc EM04 adopts an ergonomic design that fits the hand, making it comfortable even for long hours of use. 【Multi-functionality】 Dual mode allows connection to multiple devices. Ideal for use in the office or at home. 【Rechargeable Battery】 Rechargeable, eliminating the need for battery replacement. It's also an environmentally friendly choice. - Model Name: EM04 - Brand Name: ProtoArc - Rechargeable: Yes - Dual Mode: Yes - Multi-device Compatible: Yes - Color: White - Trackball: Yes Power Source...Rechargeable Connection Type...Wireless receiver x1, Bluetooth x2 (switchable) Other...Silent