MDR-RF840RK - Wireless headphone system with long battery life and 100m range
- 40mm driver units for deep bass response.
- Hassle-free recharging by placing the headphones on the dock (headphone charged via electromagnetic induction).
- Automatic On/Off for headphones making your batteries last longer.
- Rechargeable Battery will keep the music going.
- Battery playback time up to 15 hrs with rechargeable batteries or 28 hrs with Sony Alkaline batteries.
- Rotary Volume Control on Headphones.
Sony MDR-RF840RK . Ear coupling: Circumaural, Headphone frequency: 20 - 20000 Hz, Driver unit: 1.57" (4 cm). Connectivity technology: Wireless, Wireless range: 3937" (100 m). Battery life (max): 28 h, Battery technology: Nickel-Metal Hydride (NiMH), Battery type: AAA. Color of product: Black. Weight: 10.6 oz (300 g)