No tools needed.You can install or remove the electric bike horn within 20 seconds.<br/>Features:<br />Electric bike horn can reach 120db,loud enough to alert anyone to your presence.<br />Silicone wire controller to easily control the sound modes and volume,keeps you hand still on the bar when you press it.<br />5 sound modes provide more conveninece during cycling.<br />Built-in a 250mAh rechargeable battery,convenient to recharge with the provided charging cable.<br />IPX4 waterproof offers convenience during rainy days.<br />Easily install on most vehicles handlebars,such as motorcycle,mountain bike,e-bike,folding bike,scooter,etc.<br/>Specification:<br />Colour: Black / Blue / Red (optional)<br />Material: Aluminum alloy &#43; Plastic &#43; Silicone<br />Waterproof: IPX4<br />DB: Max. 120 db<br />Battery: 1* built-in 3.7v 250mAh polymer lithium battery<br />Fastener Strap Length: 14 cm / 5.5 in<br />Wire Controller Length: 8 cm / 3.1 in<br />Spring Coil Length: 50 cm / 19.7 in<br />Bell Size: 5.5 * 4.4 * 3 cm / 2.2 * 1.7 * 1.2 in<br />Package weight: approx. 80 g / 2.8 oz<br/>Package List:<br />1* Bicycle Bell<br />1* Charging Cable<br />1* Fastener Strap<br />1* Wire Controller