Allansound AC90-DTP DESK-TOP PORTABLE INDUCTION LOOP SYSTEM (AC90-DTP Used) Power supply: PSU: Primary 100-240 V 50-60 Hz AC Secondary 16 V DC or built-in 12 V NiMH rechargeable battery. Operating time per charge: approx. 6 h Battery charging time: approx. 3 h Output power: max. 10 W Microphone sensitivity: Up to 60 dB � 3 dB Dimensions: 200 x 185 x 70 mm (HxWxD) Weight: 635 g (with batteries)