2 PCS Industrial tools: 1 x Aluminum foil ventilation tube & 1 x Electronic Buzzer High temperature, , long lasting. Two-layer aluminum foil thickness, temperature ranges from -30 to 100 Celsius. Built-in steel wire for reinforcement and performance. Perfect for heating, ventilation, air conditioning, kitchen, bathroom, greenhouse, grow room, grow tent, etc. colour:Silver+White Material:Aluminum+Plastic Electronic Buzzer: Product Name: Electronic Buzzer;Model No.: SFM-27;Sound-making Type: Continuous Sound;Rated Voltage: DC 3-24V Rated Current: less than 12mA;Sound Pressure: more than 95dB;Operating Temperature: -20C to +45C Body Diameter: 30mm / 1.2inch;Overall Size: 47 x 33 x 25mm / 1.85inch x 1.3inch x 1.0inch(L x W x H);Mounting Hole Diameter: 3.5mm / 0.138inch Mounting Hole Distance: 38mm / 1.5inch;Wire Length: 11cm / 4.3inch; Plastic housing, DC 3-24V working voltage, black and red 2 wire, convenient for wiring. An perfect item for industrial use. Aluminum foil ventilation tube: Shape: Round Temperature range: -30 Celsius ~ 100 Celsius Pressure: 2500 pa Air: 30 m / s size:10 x 200cm Package Contents: 1 x Aluminum foil ventilation tube 1 x Electronic Buzzer Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.