Sound and light alarm device with durable plastic shell, energy saving, lightweight and portable, easy to install. 5-level adjustable volume and tone, with 1 green and 1 red LED indicator, suitable for night fishing. Compatible with conventional signal receiving hangers, suitable for different types of fishing rod holders in various terrains and times. Knob-type on/off switch for easy operation, equipped with quality speakers for clear sound. Audio-visual alarms help avoid missing fish bites, making fishing easier. Material: Engineering Plastics + Stainless Steel. Color as shown. Battery: 1 x 6F22 Type 9V Dry Battery (Not Included). Application: CN Universal Spiral Interface, suitable for all standard EU Type fishing rod brackets. LED Quantity: 1 Green + 1 Red. LED Indicator Diameter: Approx. 2mm/0.08in. Waterproof: Not Support. Size: Approx. 12.8 x 6.5cm/5.0 x 2.6in. Features five-level volume control button and five-level tone control button.