ELECOM's wireless mouse featuring an IR sensor and boasting a battery life of approximately 2.5 years. - Brand: ELECOM - Model: M-IR07DRRD - Color: Red - Number of buttons: 3 - Battery life: Approximately 2.5 years - Wireless method: IR - Size: M Thank you for viewing. The included battery is damaged as shown in the photo, so it's probably unusable. To reduce shipping costs, the outer plastic case will be removed before shipping. The battery will also be disposed of by us.