docs: function TxPowerLevelCharateristic(opts) {
  	TxPowerLevelCharateristic.super_.call(this, objectAssign({
  		uuid: 'ee0c2084-8786-40ba-ab96-99b91ac981d8',
  		properties: ['read', 'write'],
  	}, opts));
  
  	this.on('beforeWrite', function(data, res) {
  		res(data.length == 4 ? Results.Success : Results.InvalidAttributeLength);
  	});
  
  	this.toBuffer = arr2buf;
  	this.fromBuffer = buf2arr;
  }