1. Material: ABS 2. Working voltage: 4.5V 3. Working temperature: 10-50 degrees Celsius 4. Decibel: 125db 5. Installation method: SMT type 6. Communication method: magnetic induction 7. Battery: LR44 x 3 (delivered with batteries) 8. Suitable for a variety of scenarios 9. One-button switch control, simple operation 10. Using 125 decibel tweeter, the sound is loud 11. The main body is made of ABS resin, which is durable and has a smooth surface 12. Dimensions: host: 7.5 x 3.8 x 1.15 cm, magnetic stripe: 3.3 x 1.18 x 0.85 cm 13. Weight: 31 grams
