Elpa [Wireless Chime] Receiver + Push Button Transmitter Set EWS-S5030 EWS-S5030 White

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■Power supply: Receiver - 3 x AA batteries (sold separately) or DC 4.5V center positive. Compatible plug: Outer diameter Φ5.5mm, inner diameter Φ2.1mm (when using a separately sold AC adapter) Push-button transmitter - 2 x CR2032 coin-type lithium batteries (sold separately) ■Battery life: Receiver - Approximately 1 year (when used 10 times a day, volume 4, high-pitched ping-pong) *When using alkaline batteries Push-button transmitter - Approximately 2 years (when used 10 times a day) *Battery life may be shorter depending on battery performance and usage conditions. ■Volume: Approx. 88dB/50cm ■Radio wave range: Approx. 120m (line of sight) ■Frequency: 313.625MHz (Specified low-power device) ■ID code: Approx. 250,000 combinations ■Operating temperature range: 0℃ to 40℃ ■External dimensions (approx.): Receiver: Width 142 x Height 80 x Depth 29 (mm) (maximum) Push button transmitter: Width 40 x Height 91 x Depth 19 (mm) (maximum) ■Weight: Receiver: Approx. 138g (excluding batteries) Push button transmitter: Approx. 38g (excluding batteries) ■Waterproof rating: IPX4 splash-proof (push button transmitter) ■Accessories: 4 mounting screws (Φ3 x 20mm), 1 sheet of double-sided tape