◆ Microsoft Number Pad Black 23O-00002 ◆ Purchased about 3 years ago, but haven't used it much, so I'm selling it. ◆ Bluetooth connection only. ◆ Pairing is done by pressing the pairing button on the back for 3 seconds. ◆ There is a power switch on the back. ◆ To replace the battery, press the hole on the back with a clip or similar object and slide the cover. ◆ The original battery is still in use, so it may run out soon.