Garmin Active Speaker for VHF 315/315i. The active speaker has a knob to adjust volume up or down as needed on the compatible handset. Specifications for Garmin Active Speaker VHF 315/315i: Manufacturer: Garmin Color: Black Features of Garmin Active Speaker VHF 315/315i Unit Dimensions WxHxD: 11.1 x 11.1 x 3.8 cm Weight: 11.2 oz. (349 g) Operating Temperature Range: 5degrees F to 158degrees F (-15 degrees C to 70 degrees C) Water rating: IPX7 Compass safe distance: 20" (50 cm) Audio output power: 2.5 W nominal 4 W max Package Contents: Garmin Active Speaker VHF 315/315i Garmin 010-12769-00: Active Speaker for VHF 315/315i