Digicom 8D5815DA, Wireless siren, Indoor, 868 MHz, 120 dB, White, 40m Digicom 8D5815DA. Type: Wireless siren, Placement available: Indoor, Operating frequency: 868 MHz. Battery technology: Nickel-Metal Hydride (NiMH), Battery type: AAA, Battery voltage: 7.2 V. Dimensions (WxDxH): 4.53 x 3.15 x 7.87" (115 x 80 x 200 mm), Package dimensions (WxDxH): 9.84 x 2.95 x 4.72" (250 x 75 x 120 mm)