Features: LED/Buzzer/Vibration Alert Li-Poly battery built inside shell For 60M/200f under salt water operation Ribbed and ergonomic body Easy to use two buttons control Lost alarm Lanyard attachment loop cap Target locking function LED flash light Protection 200FT / 60M under fresh or saltwater Dimensions L 16.5? / 42CM, W 3.9?/10CM, H 2.4?/ 6CM Weight 11.6oz / 330 gram Coil 5?x4? / 13x10cm mono coil Battery Built in 3.7V 500mAh Li-Poly Battery Working Method Pulse induction. No falsing in saltwater and black sand enviorment Operating Frequency 95 kHz Tuning Automatic Indicators Audio / Vibration LED Beam Lights Response will be intense when probe close to objects. Controls Power switch (On / Off) Mode control(Vibration/Buzzer/ V+B) LED flashlight (Once power on) Two control modes: snorkel dive mode(0~8M), dive mode(8~60M)